Authorities have released 54 new video and audio clips that confirm Sacramento, California, police waited several minutes to assist Stephon Clark, an unarmed black man who was shot dead by law-enforcement officers last month. Clark was shot in his grandmother’s backyard on March 18, sparking an outcry and widespread protests. The newly released clips, more than 15 hours of material in total, show police muting their microphones when they began speaking with others after the shooting, and two officers administering CPR on Clark’s motionless body more than five minutes after the shooting. The officers are shown spending one minute handcuffing and searching him before beginning to administer CPR. By the time fire department rescue workers were cleared by police to enter the scene—about a minute after CPR began—the video appears to show that Clark was already dead.