Gay porn star Karim, real name Christian Bouthillette, has died. He was 52.

According to the Florida Agenda, Bouthillette was found in his Wilton Manors, Florida apartment “unattended” in a bath tub on Monday, January 28. He lived in the high rise with his partner, Frank Anguiuli.

Officials have ordered a toxicology report to determine an exact cause of death. Speculation includes a massive heart attack, possibly brought on by an overdose. (Bouthillette was recently arrested for cocaine-related offenses.)

Bouthillette modeled for COLT studio.

“It is with a heavy heart that we report that we have lost one of our most cherished COLT Men from the COLT history books and as of recent, Mr. COLT Man Karim,” the studio wrote in a blog post.

Ken Hunt, the owner of New York City-based Steel Gym, had employed Bouthillette as a personal trainer.

“I remember being at Fort Lauderdale Beach with him last year,” Hunt said. “He was very friendly, but I remember him saying that it was funny how most people only saw him as this big muscular guy, how they felt they 'knew' him from his fame as a Colt model. But that wasn't the deeper part of Christian. It's really a terrible loss.”