According to the newspaper, officials are trying to filter through Jackson's numerous doctors in a bid to reconstruct the singer's medical history.
Authorities are investigating allegations that Jackson had been consuming painkillers, sedatives and antidepressants. The powerful sedative Diprivan, which is usually administered by anesthesiologists in hospitals, was found in his home. It was not known what drugs, if any, Jackson obtained from doctors.
At least five physicians who prescribed medication to him are under investigation, sources have told The Times.
Did you get a ticket to Michael Jackson's memorial? CBS wants to talk to you! Just send us an e-mail with your name, phone number, location and any additional contact information.
Meanwhile, Jackson's planned summer concerts in London were just the beginning of a wholesale comeback, reports CBS News correspondent Ben Tracy.
Frank Dileo managed Jackson in his 80's heyday when the thriller and bad albums conquered the charts.
"He said, 'Frank this is our time again,'" Dileo recalls Jackson telling him.
Dileo says Jackson was ready to reassert himself in pop music.
"If London would have gone well, we talked about doing 40 stadium dates in Europe," Dileo told Tracy.
They also discussed a new studio album and in the months before his death, the "King of Pop" had been reassembling his court, reports Tracy.
In addition to Dileo, Jackson rehired John Branca, his former attorney who negotiated some of his most lucrative deals.
"He was trying to go back to the good ole times," said CBS News consultant J. Randy Taraborelli, a Jackson biographer. "He was hoping to reclaim his throne with these two guys masterminding his career."