Michael Jackson

Michael Jackson's sister, LaToya, told a British tabloid she believes the singer was "murdered."

"I believe Michael was murdered, I felt that from the start. Not just one person was involved, rather it was a conspiracy of people," the 53-year-old told the U.K.'s Daily Mail.

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LaToya Jackson said "a shadowy entourage" cut her brother off from family and friends and forced him to sign up for 50 comeback concerts at London's O2 arena.

The entourage also gave Michael drugs that led to his death, she said.

See Michael Jackson's life in photos

The Los Angeles County coroner will not receive the results of toxicology tests performed on Michael Jackson for several weeks. But LaToya Jackson said a private autopsy revealed that four fresh needle marks were found on her brother's neck, the Daily Mail reported.

Police said last week they have not ruled out homicide in Jackson's death.