The unarmed man who was shot and killed by a reserve sheriff's deputy in Tulsa, Oklahoma in April had methamphetamine in his system when he died, according to an autopsy report released Tuesday, NBC News reported. Eric Harris was diagnosed with "acute intoxication by methamphetamine" when he was fatally shot by Robert Bates during the arrest after an April 2 sting operation, the report said. Harris also suffered from cardiovascular disease and hypertension. Bates, a 73-year-old retired insurance executive, has pleaded not guilty to a manslaughter charge. He has maintained that he meant to grab his Taser, but accidentally grabbed his gun instead.