Educated at the Royal School for Deaf Children at Margate, Kent; had a history of aggressive behavior due to frustration. After leaving school, became an apprentice joiner, but was unable to hold any job for long because of his aggressive behavior, and became a sometime manual laborer. He was unemployed in 1978 when he became very upset the day after his mother died from a fall down stairs. When his social worker came to visit him, Gregson killed him with a knife. In his trial, he pleaded guilty to manslaughter, not murder, because of his mental state. His plea was accepted and he was sent to a high-security institution for the criminally insane, eventually being released in the late 1980s. Died at Southampton.
Deaf Crime Casebook, p.95-99.