Alan O'Neill, who played Hugh on FX's "Sons of Anarchy," has died at age 47, his manager Greg Meyer confirmed to Variety.
O'Neill's body was discovered by his girlfriend in the hallway of their Los Angeles apartment on Wednesday night, Reuters reported. According to TMZ, the Irish-born actor reportedly had a history of chronic heart problems and was a heavy smoker, in addition to struggling with a drinking problem.
No foul play is suspected in the actor's death.
O'Neill's agent Annette Walsh described him as brilliant and funny.
"I'll personally miss knowing Alan isn't sharing the planet with us any longer, despite the miles between L.A. and Dublin, Alan was only ever a phone call away," she said.
O'Neill is widely known for his role in the sixth and seventh seasons of Kurt Sutter's hit FX series, but the actor's career dates back to the 90s. He also played the regular role of Keith McGrath in the drama series "Fair City" -- set in the town of Carrigstown -- from 2006 to 2012.
Making his acting debut in the 1997 TV movie "Ballyseedy" as Captain Jim Clarke, O'Neill soon followed up with a run on the 2001 mini-series "Rebel Heart." He also went on to star in the 2002 short "Strangers in the Night" as Tony, the psychotic ex-boyfriend, 2007's "32A" as Paddy, 2009's "Moore Street Masala" as Robert, and in the U.K. crime drama "Inspector George Gently" the same year.
O'Neill also appeared on "Undercovers" in 2010 as well as "Shadow Dancer" and short "Invisible," both in 2012. His most recent credits include the Captain in 2016's "Urge," in addition to his announced role as Pepper in the upcoming horror film "Charlie Lives: The Family's Return."