Police guard the front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

Police guard the front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

Police guard the front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW TPX IMAGES OF THE DAY)

Police guard the front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

Police guard the front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

A woman puts up a sign announcing counselling hours in the front entrance of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

Police guard an entrance to Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

A girl walks with flowers in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: EDUCATION CRIME LAW)

A girl places flowers in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW SOCIETY EDUCATION)

Students gather to spray paint a rock in front of Jonathan Law High School in honor of Maren Sanchez who was killed at the school in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION TPX IMAGES OF THE DAY)

Students mourn in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. A 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Ed Kovac, the cousin of slain student Maren Sanchez, addresses the media in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. The 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students gather behind a freshly painted rock in honor of slain student Maren Sanchez in front of Jonathan Law High School in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

The flag is at half-staff in front of Jonathan Law High School in Milford, Connecticut, April 25, 2014, in honor of Maren Sanchez, a student who was stabbed on Friday inside the school. The 16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

People embrace on the beach during a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

People embrace on the beach during a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

People gather on the beach for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Students arrive at the beach for a vigil in honor of slain student Maren Sanchez wearing their prom dresses in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Students arrive at the beach for a vigil in honor of slain student Maren Sanchez wearing their prom outfits in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Students arrive at the beach for a vigil in honor of slain student Maren Sanchez wearing their prom clothes carrying balloons in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Mourners embrace at the beach for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Students arrive at the beach in their prom outfits for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

Students arrive at the beach in their prom outfits for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION OBITUARY)

People gather on the beach for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students arrive at the beach in their prom outfits for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

People gather at the beach for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Balloons are released at the beach during a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students in their prom outfits walk down a pier to take a photograph after a for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. The victim, Maren Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)

Students walk down a pier in their prom outfits to take a photograph after a for a vigil in honor of slain student Maren Sanchez in Milford, Connecticut April 25, 2014. The16-year-old girl was killed on Friday in an attack inside a Connecticut high school and authorities were investigating reports she was stabbed by a fellow student after rejecting his invitation to the prom, police said. Sanchez, a junior at Jonathan Law High School in Milford, was pronounced dead at the hospital shortly after the 7 a.m. (1100 GMT) attack, Milford Police Chief Keith Mello told a news conference. REUTERS/Michelle McLoughlin (UNITED STATES - Tags: CRIME LAW EDUCATION)