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. No possible cause of death was not mentioned, but TMZ's sources told the publication that there were no signs of foul play, and that autopsy results should be available soon.
He had roles in Undercovers, Inspector George Gently and Rebel Heart, as well as appearances in Strangers in the Night and Moore Street Masala.
Fair City star Alan O'Neill has died at the age of 47, his manager has confirmed.
He last appeared in the 2016 thriller Urge as Captain alongside James Bond legend Pierce Brosnan and Canadian actor Justin Chatwin.
O'Neill was born in Ireland and appeared on Irish TV shows like "Fair City".
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He memorably played Hugh in Sons of Anarchy.
Added Kristen Renton, who portrayed Ima Tite on the series, "RIP sir..."
Celebrities took to Twitter on Thursday, June 7, to pay tribute to O'Neill.
Alongside a montage of pictures, she wrote: "One of the first films I did and a privilege to act across from @AlanONeill19". A great man, sadly missed. "My thoughts are with his partner, children, family and friends at this time. May he rest in peace".