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