British officials have reached a ruling of accidental death for a 13-year-old who was killed trying to do a stunt from the "Jackass" movies.

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The death of Daniel Fox of High Wycombe was recorded on his camera phone, The Daily Mail reports.

He was killed instantly when the bike he and a friend were riding smashed into a lamppost after speeding down a hill at up to 40 mph.

A witness told the coroner's inquest that Fox was sitting on a seat taped onto the handlebars of Ben Trew's mountain bike.

Trew, who suffered massive head injuries, remains hospitalized four months after the crash.