Murray is a 1989 graduate of Meharry Medical College in Nashville, who practices medicine in Nevada, California and Texas.
Court records say Murray has more than $400,000 worth of legal judgments against him, including child support and default on a $71,000 education loan. Murray was 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.
Randy Phillips, the promoter of Jackson's 50-concert London comeback said Jackson himself insisted the company hire Murray to be his personal physician. Phillips talked about Jackson's health during a press conference when the opening concert was delayed.
"Not that I'm a doctor, but I would trade my body for his," Phillips said of Jackson at the time. "He's in fantastic shape."
Jackson's family is also suspicious of the doctor. Murray's behavior in their son's final moments didn't sit right with the Jacksons, said Rev. Jesse Jackson, a friend of the family.
"When did the doctor come? What did he do? Did he inject him? If so, with what?" Rev. Jackson said in an interview with ABC News. "Was he on the scene twice? Before and then reaction to? Did he use the Demerol? It's a very powerful drug. Was he injected once? Was he injected twice?"
Previously announced acts, such as Beyonce and Ne-Yo, hoped to change their planned performances to honor Jackson, producer Stephen Hill told The Associated Press. Other artists who hadn't planned to attend the ceremony, including Usher and Justin Timberlake, tried to catch last-minute flights to Los Angeles to participate.
A vigil is also planned at the original home of Motown Records in Detroit. The child singer recorded at the studio there when he was a member of the Jackson 5.
Rev. Al Sharpton, who said he was meeting with the Jackson family Sunday, told The Associated Press that Jackson's family is considering his idea of having "massive, simultaneous celebrations of Jackson's life across the globe."
"That kind of fame is something of the past. We'll never see people as famous as they were again. Why? Our culture was more unified 40 and 30 years ago," said Wall Street journalist and cultural historian Peggy Noonan on "This Week With George Stephanopoulos." "We've lost those days. ... In part what we celebrate is missing them when they leave us."
Los Angeles fire and police officials are preparing for what they expect will be a massive turnout at the memorial service for Jackson.
No date has been set yet for the event but authorities are expecting large crowds. The superstar's family has yet to release details of the funeral plans.
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.
President Barack Obama wrote to Michael Jackson's family expressing condolence, White House adviser David Axelrod said Sunday on NBC's "Meet the Press." Obama did not issue a statement following Jackson's death, but the White House has said the president saw the pop star as a spectacular performer whose life had sad and tragic aspects.