For two decades John Kamara seethed from behind bars against a system that had wrongfully locked him up for a brutal murder he did not commit.
John had been jailed for life alongside co-accused Ray Gilbert for the savage 1981 slaying of betting shop manager John Suffield, 23, who was stabbed 19 times in a botched robbery. Mr Gilbert served 36 years in prison before being released on licence, but also maintains his innocence.
Unbeknownst to John, for the entirety of those lost years, a witness statement was gathering dust in a storeroom which undermined the key evidence that helped to put him in prison. The miscarriage of justice has been explored in a documentary on the Crime and Investigation Network, called British Injustice, presented by investigative journalist Raphael Rowe - who himself served 10 years in prison for a crime he did not commit before winning an appeal.