Michael Jackson's former personal assistant is suing the late star's tour promoters.

Related: Jackson websites shut down for violating copyright

Michael Amir Williams has filed a lawsuit against AEG Live claiming he and several other plaintiffs lost out on more than $7.5 million dollars in compensation after the 'Thriller' hitmaker's death in June 2009.

The legal documents obtained by The Wrap blame AEG's decision to hire Dr. Conrad Murray - who is currently serving a four-year sentence for manslaughter - to supervise the King of Pop's health in the run-up to his 'This Is It' 20-date residency at London's The O2.

However, Marvin Putnam, AEG's lawyer, has slammed the claims, saying: "This lawsuit is clearly frivolous; it is literally barred by at least four different legal doctrines. The easiest is that Mr. Williams was a personal employee of Michael Jackson's, and was never a beneficiary of Mr. Jackson's contract with AEG Live. As such he has no legal standing to sue on that contract. Nor can he legally bring a claim for Mr. Jackson's wrongful death.

"It is truly unfortunate that so many see Mr. Jackson's demise as an opportunity to grab as much for themselves as possible.

"This is just the latest wrongful-death lawsuit with someone hoping to profit from Michael Jackson's tragic death in the same way they profited from his life."

Williams' class-action lawsuit seeks unspecified damages, citing breach of express terms of contract, breach of implied terms of contract, and breach of implied covenant of good faith and fair dealing after Murray treated Michael's insomnia by giving him the fatal dose of Propofol.