For 15 years, John Cooper haunted the villages in Pembrokeshire. Armed with a sawed-off shotgun and a balaclava, he'd fulfill the role of master burglar when he wasn't attacking or brutally murdering his more well-off neighbors. When he was finally caught, he was unrecognizable, but his downfall came when investigators remembered that he'd once appeared in a game show - and used it to help his victims positively identify him as their attacker.