Best known for his role on Sons of Anarchy, Alan O'Neill has died aged 47.
Sons of Anarchy actor Alan O'Neill has been found dead at his girlfriend's home in LA.
O'Neill reportedly had a history of heart problems and battled drug and alcohol addiction, but a cause of death has yet to be determined.
His death was confirmed by manager Greg Meyer.
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In the drama about the outlaw motorcycle gang - that was on air from 2008-14 on FX and also starred Charlie Hunnam - he played Hugh, a former member of the True IRA.
An autopsy is expected to be carried out soon to determine how the actor died, but no foul play is suspected.
O'Neill also played Keith McGrath in Fair City between 2006 and 2012.
Several stars took to social media to pay tribute to Alan.
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Entrepreneur Shawn Steiner posted: "Just heard my long time friend passed away this morning Alan O'Neil - RIP my friend".
She tweeted: "Thank you for your kindness".
"Always enjoyed working with him".
Fans of O'Neill's work have also been taking to Twitter in reaction to the news of his passing, with one hailing his on-screen bromance with Mick Nolan's Ray as "Fair City's greatest bromance". "May he rest in peace".
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