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The news comes five years after he suffered from a tragic fall that left him with severe head injuries.
Sexton passed away over the weekend in a village called Cushendall, which is located in Northern Ireland, according to The Belfast Telegraph (who first reported the news). His family was reportedly present during his time of death.
Back in 2014, the Widows actor's nephew suffered serious injuries after falling 20 feet from the top of a telephone booth and hitting his head. Sexton was enjoying a night with friends near Brighton Pier when the accident happened. He was 31-years-old at the time of the incident.