ST. PAUL, Minn. (AP) — The chief medical examiner who ruled George Floyd’s death a homicide will return to the stand Tuesday at the trial of three former Minneapolis police officers charged with violating Floyd’s civil rights. Prosecutors say Thomas Lane, J. Alexander Kueng and Tou Thao deprived Floyd of his rights when they failed to give him medical aid as Officer Derek Chauvin knelt on Floyd’s neck. Kueng and Thao are also accused of failing to intervene. Defense attorneys are trying to make the case that the officers’ training was inadequate and that the police department has a culture that teaches new officers to not question their superiors. They have said that Chauvin, the most senior officer on the scene, took charge the day Floyd was killed.