Katherine Jackson appears to have opened again a can of worms again against her son, deceased Pop King Michael Jackson, when she filed a $40-billion lawsuit against the London producers of Michael's concert, AEG.

The Los Angeles judge handling the case has allowed the concert producer to dig up Jackson's sexual molestation cases to establish his use of drugs.

Now, it is not only the concert producer who is digging dirt against Jackson, who died of propofol overdose in 2009, but also the former boyfriend of famous pianist Liberace. Scott Thorson, is reviving his claim that he and Michael were lovers for six years.

Thorson is one of the main characters of a film about Liberace, Behind the Candelabra, with Hollywood actor Matt Damon playing the role of the boytoy-cum-driver, while Michael Douglas portrays the gay pianist.

Thorsen, now 54, said Liberace introduced him to Michael in the late 1970s, at about the same time that Jackson's hit song Thriller came out.

"Michael was very generous, too. He treated me well," Mail Online quoted Thorsen.

He first disclosed his sexual relationship with Jackson in 2004 in an interview with The National Enquirer, identifying the home of the late impersonator Danny La Rue as the place of their first tryst where their love-making session lasted an hour. Jackson, however, denied then having an affair with Liberace's driver and lover.

He added that Liberace and him underwent plastic surgery at about the same time Michael had his nose job, and they healed together at the pianist's home in Palm Springs.

His alleged affair with Michael was about the same time that Jackson was being linked to actress Brooke Shields.

Thorsen is currently staying at the Bunny Ranch brothel in Nevada, owned by Dennis Hof, who bailed out Liberace's former lover after Thorson was arrested in May on charges of burglary and identity theft for using stolen credit cards.

Thorsen was 17 when he met the 54-year-old gay pianist who died of suspected AIDS in 1986. Liberace broke up with Thorsen which led the former driver to launch an unsuccessful $113 million lawsuit against the famous pianist.

He was recently diagnosed with stage 2 cancer.