The Los Angeles coroner’s office has reported that “lethal levels” of propofol were found in Michael Jackson‘s system. Propofol is an anaestic only used in hospitals prior to surgery. According to the Los Angeles Times, Jackson’s doctor Conrad Murray admitted to LAPD detectives that he’d been treating Jackson for insomnia with propofol every night for six weeks. Murray was worried that Jackson was becoming addicted to the drug and was trying to wean him off by lowering the dosages and mixing it with two other sedatives, lorazepam and midazolam. On June 23, he gave Jackson only the two latter medications to sleep. On the morning of June 25, the day Jackson died, Murray gave him valium at 1:30 a.m. When Jackson still was unable to sleep, he injected lorazepam intravenously at 2 a.m. Just an hour later, he gave the singer midazolam and continued to administer a variety of drugs throughout the morning. At 10:40 a.m., when Jackson was still awake, Murray gave him propofol. Murray told detectives he then left Jackson alone to make personal phone calls. Police said Murray told them he returned at 11 a.m. to find Jackson had stopped breathing, but records show paramedics weren’t called until almost 90 minutes later. During that time, police suspect that Murray made three calls to his employees to remove evidence from his Houston medical office and storage unit. Murray did not tell paramedics or emergency room doctors that he had administered propofol. Authorities said that omission could help police pursue an involuntary manslaughter charge.