Damn, this is messed up. Chris Staniforth was chatting with a friend after a job interview, felt pains in his chest, started to spasm, and passed away. Cause of death: DVT, caused by a blood clot blockage that can result after long periods of restricted movement — the reason you’re given little exercise cards on aircraft. “He could play for hours and hours on end, sometimes 12 hours in a stretch,” said his grieving father.