Ash Kelley

On February 8, 1983, a routine plumbing job in North London uncovered human remains that would lead to one of Britain's most disturbing serial murder cases. The discovery of Dennis Nilsen — and his confessed 15 victims — revealed critical gaps in how European police tracked predatory killers operating within urban anonymity.

Dennis Nilsen, a Scottish-born serial killer, murdered a minimum of 12 young men and boys in London between 1978 and 1983. His crimes went undetected for years until a plumber's discovery in February 1983 led to his arrest and eventual confession to one of Britain's most shocking killing sprees.

In the early morning hours of March 3, 1993, a family was murdered in their Maryland home in what appeared to be a robbery gone wrong. But investigators would uncover a chilling scheme: a father willing to kill his own disabled child and ex-wife for access to a multi-million-dollar trust fund.