Derek Bentley's family began a campaign to clear his name.
His sister, Iris, claimed her brother had learning difficulties and had a mental age of an 11-year-old and was also an epileptic, unable to read or write.
For years she kept his case in the public eye, writing letters to politicians, giving interviews and talks and writing a book.
In 1991 a film Let Him Have It was made of Bentley's story highlighting the injustice of the case.
Eventually, in 1993 the then Home Secretary Michael Howard granted Bentley a partial pardon, saying it was clear he should never have been hanged but he remained guilty of taking part in the murder.
In 1998 the Appeal Court quashed Bentley's conviction on the grounds the original trial judge was biased against the defendants and misdirected the jury on points of law.
Scientific evidence also showed the three police officers who testified about Bentley shouting "Let him have it" had lied under oath.
Iris Bentley died in 1997 before the case was referred back to the Appeal Court.
Craig served 10 years before being released.