Michael Alig, the notorious "club kid killer," was found dead from an apparent heroin overdose in his Manhattan apartment on Christmas morning. He was 54.

According to the New York Daily News, Alig "lost consciousness inside his Washington Heights apartment on W. 159th St." at about 3 am. His boyfriend told the police that Alig was doing heroin shortly before he passed out. He was found dead at the scene.

In the late '80s and early '90s Alig was the leader of the "Club Kids," an infamous group of partiers in New York's club scene.

Alig’s party heydays—and the murder of his drug dealer/friend Angel Melendez in 1996—were chronicled in Jamees St. James' book, Disco Bloodbath, which was the source material for the "shockumentary," Party Monster—and the subsequent Macaulay Culkin/Seth Green 2003 feature film of the same name, produced and directed by World of Wonder's Fenton Bailey and Randy Barbato. Alig was released from jail in 2014 after serving 17 years for the murder and dismembering of Melendez.

Alig was also the subject of the 2015 documentary, Glory Daze, which took a deeper look at the crown prince of clubland and the culture he was a part of.

As NewNowNext previously reported, Alig thought Glory Daze was "an accurate, if uncomfortable, portrayal."

“I think [it’s] fair,” he said at the time of the film's release. “No one is all good or all bad. Everyone is a little of both."

"I was such a spoiled brat! It’s a wonder I had any friends,” he added. "But there are things I am incredibly proud of, too—the way the club-kid scene gave so many disenfranchised people a sense of home, of family.”