The Los Angeles County coroner's office announced it concluded Jackson's autopsy at 4 p.m. PT Saturday, but the determination of the cause of the pop star's death has been deferred because the medical examiner ordered additional toxicology, neuropathology and pulmonary tests.
Craig Harvey, operations chief of the L.A. County coroner's office, said the tests will take four to six weeks to complete, at which time he anticipates being able to issue a final cause of death.
Jackson's brother Jermaine said Thursday night at a press conference that the singer's doctor had tried to resuscitate him.
"His personal physician, who was with him at the time, attempted to resuscitate my brother, as did the paramedics who transported him to Ronald Reagan UCLA Medical Center," Jermaine Jackson said in the announcement that confirmed Michael Jackson, 50, had died.
Before authorities confirmed to ABC News that Murray was being sought for an interview, speculation swirled as to who might be the "personal physician" who was with Jackson at the time of his death.
Murray personally has been taken to civil court in Clark County twice in the past year by Capital One Bank for unpaid bills of around $2,000 in total.
The LAPD said it knew Jackson had several doctors.
For years, Jackson has been treated by Dr. Arnie Klein, a dermatologist. It was in Klein's office that Jackson met Debbie Rowe, the mother of his first two children. A housekeeper at Klein's homes said the doctor was "out of town."
The Web site TMZ.com reported the doctor lived at home with Jackson, but police could not confirm that.
Paramedics were called to Jackson's rental home in the Holmby Hills neighborhood of Los Angeles Thursday afternoon. The singer was taken to UCLA, where according to his brother, doctors attempted to resuscitate him for over an hour.
From Los Angeles to Pakistan, Jackson's fans mourned the pop icon's death. Vigils were set up across the United States and fans continued to place flowers at Jackson's star on the Hollywood walk of fame, and outside the residence that he was renting in Los Angeles.
A vigil is planned at the original home of Motown Records in Detroit this evening. The child singer recorded at the studio there when he was a member of the Jackson 5.
Meanwhile, record stores around the country are reporting a surge in sales of Jackson's albums and his songs have jumped on the charts. In Britain, where he was to perform a series of concerts, starting in July, his 2003 compilation, "Number One," is expected to reach the top spot.
Jackson, who reportedly had debt of as much as $400 million, could leave a financial and legal conflict in his wake.
There are already talks as to whether his ex-wife will fight for custody of the children. Jackson was the sole custodial parent of his three children and Rowe has not been a part of their lives. The mother of the youngest, a surrogate, has never been disclosed.