Sons of Anarchy stars are mourning fellow cast member Alan O'Neill, who died after being found unconscious by his girlfriend in their Los Angeles apartment Wednesday night, Variety reports. He was 47. The Irish actor starred as former "True IRA" member Hugh in the sixth and seventh seasons of the FX drama. TMZ reports that O'Neill was a heavy smoker with a history of heart problems, as well as drug and alcohol abuse. An autopsy will be carried out, but foul play isn't suspected, according to law enforcement sources. O'Neill was best known in the US for his role in Sons of Anarchy, though he was known in Ireland as a star of the Fair City soap opera from 2006 to 2012, reports the Irish Times.
"My good friend Alan O'Neill died today....we worked together on The Sons Of Anarchy...my condolences to his family," tweeted co-star Timothy Murphy. O'Neill's agent, Annette Walsh, offered condolences to his partner, children, family, and friends on the loss of a "brilliant, funny, and kind human being." "I'll personally miss knowing Alan isn't sharing the planet with us any longer, despite the miles between LA and Dublin," she said. "Alan was only ever a phone call away. May he rest in peace." People reports that O'Neill's death comes a month after the suicide of Tycho Spelis Chiusano, the 16-year-old son of Sons of Anarchy star David Labrava. (Read more Sons of Anarchy stories.)