Who Killed Lin and Megan?

In 1996, Lin Russell and her daughters Megan, 6, and Josie, 9, were viciously attacked whilst walking home from school. Only Josie survived. The man arrested for the crime has always claimed his innocence. This fascinating true crime documentary reinvestigates the case that sent shockwaves through Britain. Is the right person behind bars or could a known serial killer be the real culprit?