By Jonathon Hill & Charlie Duffield The sister of a man who was beaten to death with a dumbbell has issued a renewed plea for information twenty years on from his brutal death. Kevin Lavelle died following an argument with a group of Welsh railway workers in a pub in Oxfordshire on June 25 2004, when it turned physical. The 29-year-old father-of-two from the Dingle area of Liverpool sustained fifty injuries to his body when he was repeatedly battered with the weight, WalesOnline reports. He was staying at the Cricketers pub in Banbury as he was was working close by in his role as a crane opera…