( CNN ) -- Michael Jackson could n't sleep . A coroner preliminarily has concluded Michael Jackson died of an overdose of propofol , court documents say . Maybe it was anxiety over his upcoming comeback concert series in London , England . Perhaps his body was trying to process too many different medications . The reason may never be known , but a sworn affidavit makes clear that the King of Pop could n't get rest the night before he died on June 25 . The affidavit , from Detective Orlando Martinez of the Los Angeles Police Department , outlines probable cause for search warrants on the offices of doctors who are thought to have treated Jackson . Yet it also opens a window into Jackson 's final hours , revealing information about the singer 's treatment and the drugs given him by Dr. Conrad Murray , his personal physician , before his death . Watch a panel discuss Jackson 's death » . Based on interviews , visits to Jackson 's home as well as records and documents gathered during the investigation , the affidavit provides the following account of Jackson 's last days : . In May , Jackson hired Murray , a cardiologist . The singer was spending long days rehearsing for concerts that he saw as crucial to reviving his career . For six weeks , Murray told police that he treated Jackson for insomnia . He said he had been giving the singer an intravenous drip with 50 milligrams of propofol , diluted with lidocaine , every night to help him sleep . Jackson was already familiar with propofol , a powerful anesthetic , Murray said . The singer even called it his `` milk '' because of its milky appearance , he said . With the concerts approaching , Jackson started to need these drugs every night , Murray said -- and the doctor said he worried that Jackson was becoming addicted to propofol . He wanted to wean Jackson off the drug . Three days before Jackson 's death -- on June 22 -- Murray gave the singer a combination of drugs that he hoped gradually would move the singer off propofol . That mixture involved propofol , the anti-anxiety drug lorazepam ( known by its brand name , Ativan ) and midazolam ( known as Versed ) . It succeeded in helping Jackson to sleep for that night and the next , Murray said . But by the night of June 24 , Jackson again apparently was unable to sleep . Learn more about the events of Jackson 's final hours » . At 1:30 a.m. on June 25 , Murray decided to forgo the propofol in favor of 10 milligrams of Valium . Half an hour later , with Jackson still awake in bed , Murray injected the singer with two milligrams of lorazepam . It still was n't working . At 3 a.m. , Murray gave the singer two milligrams of midazolam , pushed slowly into his IV . And two hours later , with Jackson still awake , Murray administered another two milligrams of lorazepam through Jackson 's IV . The drugs did nothing to help Jackson sleep . At 7:30 a.m. , Murray gave the singer another two milligrams of midazolam in his IV . By that point , Murray was n't even leaving Jackson 's room anymore , let alone his bedside . The doctor told police he sat next to the singer in his bedroom , monitoring Jackson 's pulse and oxygen levels . More than three hours later , despite a night of medication and doctor 's care , Jackson remained awake . Jackson was repeatedly asking -- even demanding -- that Murray give him more propofol to help him sleep , the doctor told police . So Murray finally administered 25 milligrams of propofol diluted with lidocaine via Jackson 's IV drip . The singer now had his `` milk , '' and it worked . After a restless night , Jackson was finally able to close his eyes and go to sleep . Murray told police he watched Jackson sleep for about 10 minutes before going to the bathroom . It had been a long night for both of them . The trip to the bathroom took less than two minutes , Murray told police . But when he came back , he said , he saw Jackson was n't breathing . He started cardiopulmonary resuscitation , but it did n't work . Jackson was rushed to the hospital and pronounced dead later that afternoon . According to court documents released Monday , Dr. Lakshmanan Sathyavagiswaran , the chief medical examiner-coroner for Los Angeles County , concluded Jackson died of an overdose of propofol . Sathyavagiswaran reached that preliminary conclusion after reviewing toxicology results carried out on Jackson 's blood , according to a search warrant and affidavit unsealed in Houston , Texas . The coroner 's office would not comment on the statements in the affidavit . But Ed Chernoff , Murray 's attorney , took issue with some of the information included in the court documents . `` Much of what was in the search warrant affidavit is factual . However , unfortunately , much is police theory , '' Chernoff said , specifically referring to media reports the coroner would rule Jackson 's death a homicide . The Los Angeles County district attorney 's office said it has not yet seen a police report on the case , and no criminal charges have been filed .
Affidavit opens a window into Michael Jackson 's final days . Doctor reportedly said he thought Jackson was becoming accustomed to propofol . Affidavit : ' Conrad Murray gave singer several drugs on or before June 25 ' . Murray 's lawyer calls some information in affidavit ` ` factual , '' other ` ` police theory ''