Tributes have been paid to a keen sportsman and biologist who died after apparently running into a low-hanging high voltage cable.
James Kew, 41, from Radwinter Road, Ashdon, Essex, was leading a run with three others when he collided with the cable in a field in nearby Newport at about 8.40pm on Tuesday.
Police, firefighters and paramedics were called but he died instantly. Two others suffered minor injuries.
It is thought the cable, which carried about 11,000 volts, was hanging across the path.
Dr Kew was a leading member of the Saffron Striders running club and played for Bishops Stortford Hockey Club.
A statement on the Saffron Striders' website said: "It is with the deepest regret we have to announce the death of James Kew, as a result of a tragic accident whilst out running. Our thoughts and sympathies are with his family at this very difficult time."
Dr Kew was an experienced runner and is currently ranked first out of 58 in the Saffron Striders' Championship 2012. He had previously completed the London Marathon in three hours and five minutes, finishing 1,591st in the race. He regularly ran 10km races in under 40 minutes.
Writing on Twitter, Bishops Stortford Hockey Club said: "Very sad news about 4th XI and Vets player James Kew who sadly died in a freak accident whilst running yesterday."
Dr Kew had worked as a director of biology in the research department at GlaxoSmithKline since 2010. He had a BSc in biological sciences from the University of Exeter and a PhD in developmental neuroscience from the University of Cambridge.
His family was said to be distraught and have asked not to be approached. Police, firefighters and the Health and Safety Executive are investigating.