Deputy district attorney David Walgren (R) holds an infusion tube as he questions anesthesiology expert Dr. Steven Shafer during Dr. Conrad Murray's trial in the death of pop star Michael Jackson in Los Angeles October 20, 2011. The claim by attorneys of Murray, Michael Jackson's doctor, that the singer killed himself with an injection of the powerful anesthetic propofol is a "crazy scenario," a top anesthesiology expert testified on Thursday. REUTERS/Reed Saxon/Pool (UNITED STATES - Tags: CRIME LAW ENTERTAINMENT)