LOS ANGELES - - Los Angeles police completed an "extensive interview" Saturday night with the doctor who was with Michael Jackson when the pop star went into cardiac arrest, and a source close to the investigation said detectives found "no red flag" during discussions about the death.
A private pathologist, meanwhile, conducted a second autopsy on Jackson's body, hours after it was released to relatives by the Los Angeles County coroner.
Coroner's officials had said that Jackson had been using prescription drugs, and the investigation is focused on whether Jackson overdosed. But after the Los Angeles Police Department completed its interview with Conrad Murray, Jackson's personal physician, the source said: "There was no red flag. There was no smoking gun."
The source spoke to the Los Angeles Times on condition of anonymity because the investigation is ongoing.
Los Angeles police have said that Murray is not suspected of wrongdoing and is cooperating with the investigation into the performer's death. The law firm Murray has hired said in a statement that he was "considered to be a witness to the events surrounding Michael Jackson's death."
The coroner's office, which completed its autopsy on Friday, said there was no evidence of foul play. The coroner has only listed the cause of death as "deferred" until more tests are complete. Results could take as long as six weeks.
Sources confirmed that Jackson's family - apparently eager for quicker information and looking to get an independent opinion - had a second autopsy performed. Jackson, 50, was stricken Thursday at his rented chateau Los Angeles and died after suffering what his brother Jermaine Jackson said was cardiac arrest.
The Rev. Jesse Jackson said earlier Saturday that the singer's family wanted a private autopsy of the pop icon because of unanswered questions about how he died and the doctor who was with him.
"It's abnormal," Jesse Jackson said a day after visiting the Jackson family. "We don't know what happened. Was he injected and with what? All reasonable doubt should be addressed."
Families who obtain a second autopsy often do so because they want to confirm the cause of death. A second autopsy can also give relatives information much faster than an autopsy conducted by law enforcement officials, said Michael Baden, a former chief medical examiner in New York City who has investigated or testified in a host of high-profile cases, including the criminal trials of O.J. Simpson and Phil Spector.
A private pathologist can rush toxicology tests through a lab to help determine what drugs were present at the time of death, he said.
"The second autopsy will give the family a lot more information than they have -- right away, within a few days," Baden said. They typically cost between $10,000 and $20,000.
There are, however, limitations. The reason an official autopsy can take longer is that government authorities use methodology that generates a chain of evidence admissible in court - "and that takes a little bit of time," Baden said.
The Associated Press contribute to this article.