People pray for an end to executions, as well as in remembrance of the 9 victims from the 2015 Charleston church shooting, at Zion Baptist Church in Columbia, South Carolina, U.S. June 17, 2021. REUTERS/Sam Wolfe 

People pray for an end to executions, as well as in remembrance of the 9 victims from the 2015 Charleston church shooting, at Zion Baptist Church in Columbia, South Carolina, U.S. June 17, 2021. REUTERS/Sam Wolfe 

People pray for an end to executions, as well as in remembrance of the 9 victims from the 2015 Charleston church shooting, at Zion Baptist Church in Columbia, South Carolina, U.S. June 17, 2021. REUTERS/Sam Wolfe 

People pray for an end to executions, as well as in remembrance of the 9 victims from the 2015 Charleston church shooting, at Zion Baptist Church in Columbia, South Carolina, U.S. June 17, 2021. REUTERS/Sam Wolfe 

People pray for an end to executions, as well as in remembrance of the 9 victims from the 2015 Charleston church shooting, at Zion Baptist Church in Columbia, South Carolina, U.S. June 17, 2021. REUTERS/Sam Wolfe 

Members of the Mother Emanuel A.M.E Baptist Church, site of a 2015 mass shooting, sing the U.S. National Anthem and the Black national anthem ahead of the start of the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Members of the Mother Emanuel A.M.E Baptist Church, site of a 2015 mass shooting, sing the U.S. National Anthem and the Black national anthem ahead of the start of the tenth Democratic 2020 presidential debate at the Gaillard Center in Charleston, South Carolina, U.S. February 25, 2020. REUTERS/Jonathan Ernst 

Fresh cut flowers lay below the door of the Emanuel African Methodist Episcopal Church, site of a 2015 mass shooting, before the start of the tenth U.S. Democratic presidential candidates debate in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Randall Hill 

Fresh cut flowers lay below the door of the Emanuel African Methodist Episcopal Church, site of a 2015 mass shooting, before the start of the tenth U.S. Democratic presidential candidates debate in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Randall Hill 

Members of the First Methodist Church of Gastonia, North Carolina look over a memorial at the Emanuel African Methodist Episcopal Church, site of a 2015 mass shooting, before the start of the tenth U.S. Democratic presidential candidates debate in Charleston, South Carolina, U.S., February 25, 2020. REUTERS/Randall Hill 

Sisters Heather Martin (L) and Ashley Egeland, both survivors of the Columbine high school shooting, rest in their hotel room after they attended a conference about wellness and recovery in Charleston, South Carolina, U.S., December 7, 2018. Egeland struggled for years with severe addiction after she survived the shooting. Now she works in addiction treatment and recovery. REUTERS/Leah Millis SEARCH "COLUMBINE SURVIVOR" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES. 

Sisters Heather Martin (L) and Ashley Egeland, both survivors of the Columbine high school shooting, rest in their hotel room after they attended a conference about wellness and recovery in Charleston, South Carolina, U.S., December 7, 2018. Egeland struggled for years with severe addiction after she survived the shooting. Now she works in addiction treatment and recovery. REUTERS/Leah Millis SEARCH "COLUMBINE SURVIVOR" FOR THIS STORY. SEARCH "WIDER IMAGE" FOR ALL STORIES. THE IMAGES SHOULD ONLY BE USED TOGETHER WITH THE STORY - NO STAND-ALONE USES. 

Liz Alston, church historian of Emanuel African Methodist Episcopal Church, where Dylann Roof killed nine members of a Bible study in a 2015 hate crime, sits in the front row of the sanctuary after the Sunday morning service in Charleston, South Carolina October 28, 2018. REUTERS/Harriet McLeod 

Judy Scott, mother of Walter Scott, is greeted by well wishers after former police officer Michael Slager was sentenced in federal court to 20 years in prison, in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

Walter Scott shooting witness Feidin Santana (C), who took the video of the shooting, arrives at the Charleston federal court house on the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

The family of Walter Scott, including his mother Judy Scott (R) arrives at the Charleston federal court house building for the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

The family of Walter Scott arrives at the Charleston federal court house building for the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

The family of Walter Scott arrives at the Charleston federal court house building for the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

Federal prosecutor Jared Fishman (R) arrives for the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

Federal prosecutors arrive for the 4th day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 7, 2017. REUTERS/Randall Hill 

Scott family attorney Justin Bamberg, makes a phone call outside the Charleston federal court house during a break in testimony in the sentencing hearing for former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Judy Scott, mother of Walter Scott, leaves the Charleston federal court house after the third day of testimony during the sentencing hearing of former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

A police officer patrols outside the Charleston federal court house, during a rain storm, on the third day of testimony in the sentencing hearing for former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Federal prosecutors Jared Fishman, Rose Gibson and Nathan Williams, arrive outside the Charleston federal court building during the sentencing hearing for former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Walter Scott's son Miles Scott (R) leaves the Charleston federal court building after testifying during the 3rd day of the sentencing hearing for former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Walter Scott's son Miles Scott (R) leaves the Charleston federal court building after testifying during the 3rd day of the sentencing hearing for former North Charleston policeman Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Defense attorney Andy Savage (C) arrives outside the Charleston federal court building for the 3rd day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Defense attorney Andy Savage arrives outside the Charleston federal court building for the 3rd day of testimony during the sentencing hearing for former North Charleston police officer Michael Slager in Charleston, South Carolina, U.S., December 6, 2017. REUTERS/Randall Hill 

Judy Scott (R) mother of Walter Scott, leaves the Charleston Federal Courthouse with the aid of her son Rodney Scott, during the sentencing hearing for Michael Slager in Charleston, South Carolina, on December 4, 2017. REUTERS/Randall Hill 

Walter Scott shooting witness Feidin Santana (L), who took the video of the shooting, returns with escorts after a lunch break during the sentencing hearing of former North Charleston police officer Michael Slager in federal court in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Walter Scott shooting witness Feidin Santana (L), who took the video of the shooting, returns with escorts after a lunch break during the sentencing hearing of former North Charleston police officer Michael Slager in federal court in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Blue Lives Matter supporter Scott Garland of Charleston, holds a sign for passing motorist before the sentencing hearing for Michael Slager outside the federal court house in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Blue Lives Matter supporter Scott Garland of Charleston, holds a sign for passing motorist before the sentencing hearing for Michael Slager outside the federal court house in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Scott family supporter Dmitri Ford of Charleston, holds a sign outside the federal court building during the sentencing hearing for Michael Slager in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Members of the Charleston Police gather outside the federal courthouse before the start of the sentencing hearing of Michael Slager in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

Scott family supporter Dmitri Ford of Charleston, stands outside the federal court building during the sentencing hearing for Michael Slager in Charleston, South Carolina, U.S. December 4, 2017. REUTERS/Randall Hill 

A woman wipes away tears during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie TPX IMAGES OF THE DAY 

People hold candles during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie TPX IMAGES OF THE DAY 

Police officers salute during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie 

A woman wipes away tears during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie 

A photograph of Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, is pictured during a memorial service in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie 

Police officers salute during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie 

People hold candles during a memorial service for Charleston Hartfield, an off-duty Las Vegas police officer who was killed during the Route 91 music festival mass shooting, in Las Vegas, Nevada, U.S., October 5, 2017. REUTERS/Chris Wattie 

Charleston Mayor John Tecklenburg, (L) and Interim Police Chief Jerome Taylor brief news reporters regarding a restaurant shooting in which police shot and wounded a disgruntled former employee during a hostage taking incident in Charleston, South Carolina, U.S., August 24, 2017. REUTERS/Harriet McLeod 

Bystanders wait at a perimeter set up by local police after reports of a man armed with a handgun was holding hostages at a restaurant in downtown Charleston, South Carolina, U.S., August 24, 2017. REUTERS/Harriet McLeod 

Judy Scott (R) and her son Rodney Scott, mother and brother of Walter Scott, react during a news conference after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill TPX IMAGES OF THE DAY 

Judy Scott, mother of Walter Scott, speaks during a news conference while supported by family attorney Chris Srewart (L) and family after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Judy and Walter Scott, Sr., parents of Walter Scott, hold hands during a news conference after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Anthony Scott, brother of Walter Scott, speaks surrounded by family and counsel during a news conference after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Judy Scott (R) and her son Rodney Scott, mother and brother of Walter Scott, react during a news conference after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

The Scott family and their lawyers leave the U.S. District Court after the guilty plea to federal civil rights charges by former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Walter Scott Sr. and wife Judy, parents of Walter Scott, wave to well wishers after former North Charleston police officer Michael Slager's guilty plea to federal civil rights charges in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Judy Scott (C), mother of Walter Scott, is supported by family and lawyers during a news conference after former North Charleston police officer Michael Slager's guilty plea to federal civil rights charges in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

A lone Blue Lives Matter supporter holds a sign outside the Federal Courthouse before the Federal court hearing of former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

A lone Blue Lives Matter supporter holds a sign outside the Federal Courthouse before the Federal court hearing of former North Charleston police officer Michael Slager in Charleston, South Carolina May 2, 2017. REUTERS/Randall Hill 

Malcolm Graham (C), brother of Charleston Church shooting victim Cynthia Hurd, talks with the media after Dylann Roof plead guilty to state murder charges in the June 2015 Charleston church shooting that left nine black churchgoers dead in Charleston, South Carolina April 10, 2017. REUTERS/Randall Hill 

Malcolm Graham, brother of Charleston Church shooting victim Cynthia Hurd, talks with the media after Dylann Roof plead guilty to state murder charges in the June 2015 Charleston church shooting that left nine black churchgoers dead in Charleston, South Carolina April 10, 2017. REUTERS/Randall Hill 

Prosecutor Scarlett Wilson (C) talks to the media outside the Charleston County Courthouse after Dylann Roof plead guilty to state murder charges in the June 2015 Charleston church shooting that left nine black churchgoers dead in Charleston, South Carolina April 10, 2017. REUTERS/Randall Hill 

Melvin Graham, brother of Charleston Church shooting victim Cynthia Hurd, looks on during a news conference after Dylann Roof pleaded guilty to state murder charges in the June 2015 Charleston church shooting that left nine black churchgoers dead in Charleston, South Carolina April 10, 2017. REUTERS/Randall Hill 

Dylann Roof sits in the court room at the Charleston County Judicial Center to enter his guilty plea on murder charges in state court for the 2015 shooting massacre at a historic black church, in Charleston, South Carolina, U.S., April 10, 2017. REUTERS/Grace Beahm/Pool