Damn, a third accuser has stepped forward with claims of underage sex acts with Elmo puppeteer Kevin Clash.  Clash is facing a lawsuit accusing him of sexual activity with a 16-year-old in 2000.

The accuser, now 29, will be filing a lawsuit in Manhattan Federal Court Tuesday, says the man’s attorney Jeff Herman.

He said the lawsuit is being filed as a “John Doe” because the accuser does not want to use his name.  A spokeswoman for the puppeteer said, “Mr. Clash believes this lawsuit has no merit.”

Though he wishes to remain anonymous, Herman said his client began writing a book in 2009 about his experiences with Kevin and pages from the book will be announced during a press conference on tomorrow…after the lawsuit it filed.  Of course.  We’re pubbing BOOKS at underage sex claims press conferences now?  Oh.

The lawsuit states that “John Doe” moved to New York to model at age 16, and chatted with Kevin on a gay chat line before going over to his apartment for some “some sexual activity.”  He claims Kevin went by the pseudonym “Craig” and said he was 30-years-old.

Herman said his client met Clash again in 2003 and 2004, and over a period of time figured out who Clash was.

“He saw Elmo dolls, an Emmy award and photographs of Elmo with movie stars,” said Herman.

Stay tuned for developing story…