All police found at the bottom of a cliff was a man's body in a frigid river and a Segway, the two-wheeled electric device that was supposed to revolutionize personal transport.

It was Jimi Heselden, a one-time laid-off coal miner turned self-made millionaire who had bought the Segway company only 10 months earlier. He apparently fell to his death while riding one of the sleek black-and-silver scooters. Authorities said Monday his body was found in the River Wharfe at the base of a 30-foot cliff.

Details remained sketchy — police say only that the death was not suspicious, meaning foul play is not suspected — but the incident seems certain to raise fresh questions about the safety of the Segway, which is banned on British motorways and in some U.S. cities because of safety concerns.