The Yorkshire Ripper reportedly threatened Ronnie Kray after the gangster "made advances" toward the serial killer in Broadmoor.
Convicted murderer Peter Sutcliffe, who murdered 13 women in a six-year killing spree, was convicted in 1981 and spent three decades at the high-security psychiatric hospital before being moved to HMP Frankland in 2016.
Sutcliffe described how Kray tried to flirt with him in a letter to a friend six months before his death.
