He was playing for Reading against Cardiff City in a Division Two fixture on Boxing Day 1999 when he suffered a double leg fracture. This was the last professional game that Casper, then aged 24, ever played, as he later announced his retirement the following year after failing to recover sufficiently from the injury. More than four years later, he secured undisclosed compensation in an out-of-court settlement with Richard Carpenter, the Cardiff City player whose tackle had caused his career-ending injury. By this stage, Casper was a youth team coach at Bury.
