Sons of Anarchy actor Alan O'Neill has been found dead at his girlfriend's home in LA. He was 47.

The Irish-American actor, who rose to fame playing True IRA member Hugh in seasons six and seven of the hit show, reportedly had a history of heart problems, and struggled with alcohol abuse. The death is not considered suspicious, and an autopsy will be carried out to determine O'Neill's cause of death.

O'Neill's death was confirmed by his manager Greg Meyer, while his agent Annette Walsh described him to US Weekly as "brilliant and funny."

"I’ll personally miss knowing Alan isn’t sharing the planet with us any longer," she said. "Despite the miles between L.A. and Dublin, Alan was only ever a phone call away."

While Sons of Anarchy was arguably O'Neill's most prominent work, he had a string of sucessful roles under his belt before his death.