John Crellin was an experienced TT competitor A competitor has been killed in an accident during Friday's Senior TT race in the Isle of Man. John Crellin, a civil engineer who was from the island, crashed at the Mountain Box section on the final lap of the race. The official TT website described 58-year-old Crellin as an experienced competitor who had also taken part in Manx Grand Prix events. It is believed Crellin was the only rider involved in the accident. Earlier on Friday, Manxman Crellin had finished third in the inaugural TTXGP, a race for clean emission motorcycles.