True crime cases that have gone cold with no answers are often those that fascinate us the most. Here we will look at four cases that remain a mystery and are still unsolved.
Murdered in Montana in 1983, Marie Philbrick was killed in the days before DNA analysis. Bernard Pease Jr. was convicted of her murder, but was he really her killer?
A look at the leading theories behind the rise and fall of serial killings in America, which rose during the 60s and 70s and peaked in the 80s before declining again.