Charles Mann stabbed his mother Emma 11 times in a frenzied attack . The 21-year-old then cut off his own penis in drug-induced fit of violence . Hove Crown Court heard how he had taken cocktail of drugs and alcohol . Launched the assault on mother at West Sussex home in 16 months . Mann was sentenced to December 2013 behind bars for Grievous Bodily Harm . He has been receiving psychiatric treatment since 'exceptional ' incident .
Charles Mann stabbed his mother Emma 11 times in a frenzied attack . The 21-year-old then cut off his own penis in drug-induced fit of violence . Hove Crown Court heard how he had taken cocktail of drugs and alcohol . Launched the assault on mother at West Sussex home in December 2013 . Mann was sentenced to 16 months behind bars for Grievous Bodily Harm . He has been receiving psychiatric treatment since 'exceptional ' incident .