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.

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.