Australian dancer Wade Robson's molestation claims against Michael Jackson have been labelled "outrageous and pathetic" by a lawyer representing the former king of pop's estate.
Robson, 30, originally from Brisbane, has asked a Los Angeles judge for permission to file a late claim against the dead singer's estate and an order to seal a complaint for childhood sexual abuse.
The move is a surprise as Robson, his mother Joy and sister Chantal, were staunch supporters and key witnesses during Jackson's 2005 molestation trial in Santa Maria, California.
Robson testified at the trial Jackson did not sexually assault him during sleepovers when he was a child at Jackson's Neverland Ranch and Las Vegas homes, despite a maid telling the court she saw Robson, then aged eight or nine, in a shower with the singer.
"Mr Robson's claim is outrageous and pathetic," Jackson estate lawyer Howard Weitzman said.
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"This is a young man who has testified at least twice under oath over the past 20 years and said in numerous interviews that Michael Jackson never did anything inappropriate to him or with him.
"Now, nearly four years after Michael has passed, this sad and less than credible claim has been made."
US website TMZ.com reported Robson is claiming he suffered from "repressed memory".
Robson, a choreographer and songwriter who has worked with Britney Spears and Justin Timberlake, was a frequent guest at the Neverland Ranch while aged between seven and 14.
Jackson, who died aged 50 in 2009, was found not guilty at the 2005 molestation trial and after the verdict Robson's mother said the family felt vindicated.
"I've never questioned Michael," Ms Robson told AAP.
"That's the bottom line. I've never ever had a second of a concern."
After Jackson's death, Robson issued a statement praising the king of pop.
"He is the reason I dance, the reason I make music, and one of the main reasons I believe in the pure goodness of human kind," Robson said.
Robson's complaint coincides with the wrongful death trial in Los Angeles launched by Jackson's mother Katherine Jackson and Michael Jackson's children against AEG, the promoter of Jackson's proposed 50 concerts in London.
