As a cop, I’ve apprehended hundreds of murderers, but there’s one who keeps me awake at night because I know she’d kill again. EX-MET Detective Inspector who investigated hundreds of murders in the capital has revealed the most terrifying assailant he encountered. Former Detective Inspector Steve Keogh worked for the Metropolitan Police for over a decade, investigating some of London’s most high-profile murder cases. He also served in SO13, the military’s anti-terrorist unit, where he encountered some of the country’s most heinous terrorists. Steve, 50, left his position last year, just a week before releasing a book about the hundreds…