Michael Jackson's mother, Katherine, has claimed her late son did not just die of natural causes.

She voiced her suspicion during an interview on Fox News' Geraldo at Large on Sunday (August 2).

"All I know is that my son is dead, and I don't think he just died of natural causes or whatever," she said.

"He's too young for that. Something happened, I don't know what it was and I can't say."

Her claim follows repeated accusations from the singer's father, Joseph, that foul play may have prompted Jackson's death on June 25.

The Los Angeles Coroner's Office ruled out foul play or evidence of external trauma following a post-mortem on June 26.

But a cause of death was deferred pending toxicology tests.

Meanwhile, Katherine was yesterday granted full custody of the singer’s three children.

The 79-year-old has been taking care of Prince Michael, 12, Paris Katherine, 11, and seven-year-old Paris Michael II – also known as Blanket – since her son’s death on June 25.

A LA judge also granted Debbie Rowe, the singer’s ex wife and mother of his two eldest children, visitation rights.