Fraser’s methods of torturing the gang’s victims earned him the nicknames “Mad Frankie” and “The Dentist” – he was reputed to pull out people’s teeth with pliers.
At the Richardson gang “torture” trial at the Old Bailey in 1967 he was jailed for 10 years. Two years later a further five years was added for leading a riot at Parkhust Prison.
In 1975 he assaulted three prison officers, one of whom he attempted to hang.
After completing another sentence in 1989, Fraser tried to build a career as a celebrity, appearing on television chat shows, acting as a consultant on crime and taking a stage show to the Edinburgh Fringe Festival.
In 1997, he was called as a character witness at the trial of Charlie Kray on drugs charges.
Last year he was reported to have received an Asbo following an argument over a chair in the care home where he lived.