Investigative journalist Diane Dimond, who has been covering Michael Jackson since 1993, talks to Mary Hart about La Toya Jackson's accusations that her brother was murdered.

La Toya reportedly said, "Michael was murdered, and we don't think that just one person was involved. Michael was worth well over a billion in music publishing assets and someone killed him for that. He was worth more dead than alive."

"Details to this story have been constantly changing and I have been working the phones all day," Diane tells Mary. "La Toya claims that Michael was fed all sorts of drugs. People around him kept him drugged up so they could keep him submissive and controlled."

La Toya's accusations appeared in London's News of the World. She also claims that Michael was robbed of $2 million in cash and gems on the day he died.

Diane tells Mary: "Katherine and La Toya went to the house that night and called the nanny, saying, 'I know Michael keeps cash in the house. Where's the cash?' But I gotta say, the days of Michael keeping loads of cash laying around in garbage bags is long gone. All of it is gone to his creditors.

"Now, what La Toya did find in the home? Reportedly, three oxygen tanks in the corner of Michael's bedroom, an oxygen mask on the bed, an empty pill box and a stand for an IV drip.

"In the article, La Toya also confirms the rumors that Michael had needle marks on his body, saying they were on his neck and arms. But she says none of those puncture marks were from the pain relieving drug methadone."

For more of Diane's interview, tune in to tonight's ET. Keep checking backing here for all the latest on the investigation to Michael's death.