BBC Cold Case Investigators: Chilling evidence sees pervert jailed 40 years after attacking boy
![BBC Cold Case Investigators: Chilling evidence sees pervert jailed 40 years after attacking boy](https://i2-prod.mirror.co.uk/incoming/article32850341.ece/ALTERNATES/s615/0_Chilling-piece-of-evidence-that-sent-rapist-behind-bars-40-years-after-attacking-boy.jpg)
Four decades after a 16-year-old boy was attacked in a park, cold case investigators tracked down their prime suspect using remarkable technology and historical evidence