A Melville day camp employee is accused of sex crimes and possession of child pornography.

Keith Meyn was charged Tuesday in a 112-count indictment. He pleaded not guilty to an indictment alleging he used an 11-year-old boy in sexual performances and had a massive collection of child pornography.

District Attorney Thomas Spota says his illegal activity involving children went on for more than a decade.

Meyn also founded a film company known as Psych Ward Films.

Judge Barbara Kahn set cash bail for Meyn at $250,000 cash or $500,000 bond.

The 34-year-old Oakdale man worked at Kenwal Day Camp as a counselor and director of maintenance operations. The camp's owner, Howie Feinstein, says he stopped showing up for work in mid-July.

"We had no reason to suspect he was involved in such activity while he was employed at camp, and at this time the authorities have not given us any reason to believe that this arrest is related to his employment at Kenwal," Feinstein says in a statement. "We also have contacted all our camp families and will continue to keep our families up to date, cooperate with the authorities and work in the best interest of our campers."

Prosecutors are asking any possible victims to come forward. They are being asked to call the Suffolk Police Department's Computer Crimes Unit at 631-852-6279.

If convicted of all charges, Meyn faces 50 years in prison.