Dating show killer
By the mid-1990s, he was involved in an illegal scheme to sell part of a foreign lottery, and went on the run.
His whereabouts weren't known until his death from throat cancer in 1999.5.
A multiple murderer casually appears on You'd think if someone killed two people in cold blood that they wouldn't draw attention to themselves by playing darts on telly a few years later, but that's how twisted John Cooper was.
Unknown to anyone at the time, Cooper had got away with murdering brother and sister Richard and Helen Thomas in 1985.
To do this, he "simply" memorized the patterns that came up on the show's game board.
However, his prize was taken away before he was able to cash his cheque, and two years later he was convicted of fraud by a majority jury verdict, and forced to pay £15,000 in fines – plus further money towards legal costs.
To make matters worse, the investigation into proving his guilt cost nearly twice as much as the actual jackpot.2.
The ultimate, the classic: the peak of UK game show cheating.
But it wasn't long before people on set queried the whole affair.