Mike Hagerty suddenly passed away at 67. When the news first broke out, the reason for his death was not clear. However, more details have emerged now.

According to sources, the 67-year-old was healing from an infection in one of his legs, but was still feeling unwell. His doctor referred him to the hospital for treatment, as production for the second season of his show Somebody Somewhere was slated to begin soon.

There, the "Seinfeld" star ingested an antibiotic that apparently induced a seizure and landed him in a coma from which he never fully recovered. Did the hospital accidentally kill him?

Bridget Everett of the HBO series "Somebody Somewhere" revealed his death via social media on Friday, May 6; however, she did not reveal the cause of death at the time. The character actor was best recognized for his recurrent role as Mr. Treeger on Friends from 1994 until 2004.

The show featured him in five episodes. The native of Illinois portrayed the building's superintendent for Monica Gellar and Rachel Green in New York City.

In one episode, he asked the housemates to leave. He first appeared in the second season and last appeared in the eighth season of the sitcom. He co-starred with Jennifer Aniston, Lisa Kudrow, Courteney Cox, Matt LeBlanc, David Schwimmer, and Matthew Perry. The comedian had an extensive career as a TV character actor. This year, the actor also appeared on HBO's Lucky Louie as the manager of a muffler shop and in Somebody Somewhere.

His devotion to his city of Chicago and his family were the pillars of his existence as a well-respected character actor. He will be profoundly missed. Everett added that the entire cast and crew of Somebody Somewhere admired Mike. His wife and family are in their thoughts.

Sarah Jessica Parker, best known after her role as Carrie Bradshaw in Sex And The City, paid tribute to Hagerty on social media. The 57-year-old actress acknowledged that she enjoyed his work. On Instagram, she wrote, "Heartbreaking. Admired him for years. X." Mike's Hollywood career began with "The Timber Tramps" in 1973, which led to guest-starring parts on Cheers and Crime Story (both in 1986). In the 1987 Goldie Hawn comedy Overboard, he played the famous role of Kurt Russell's lovable blue-collar best friend. But he returned to television in 1987's "Married... With Children," 1988's "Family Ties," and 1989's "Murphy Brown."