Singer Michael Jackson is suing a New Jersey man for more than $10m (£5.4m), claiming he is illegally selling the star's private property.
Jackson seeks compensation for violation of privacy and other claims
Henry Vaccaro allegedly obtained letters, pictures and lyrics belonging to Jackson through a bankruptcy sale involving the singer's parents in 2002.
Mr Vaccaro is now said to be selling the items over the internet.
Jackson's lawyer Brian Wolf said the items were not part of the bankruptcy and should not have been sold.
"Michael is outraged that someone would be attempting to sell his personal private property they don't have any right to, just as anybody else would be," Mr Wolf said.
"We're going to do everything in our power to ensure that the property is returned to him."
The legal claim was made at Los Angeles district court on Monday. Jackson is seeking compensation for copyright infringement and violation of privacy rights among other claims.