Benjamin Tewkesbury attacked Dr Robert Davis at Pettitt home in May 2012 . The 33-year-old had taken cocktail of cocaine , heroin and anti-depressants . Became paranoid , believing a group of Frenchmen were coming to kill him . Attacked Dr Davis with a bat after 15 minutes of 'rational ' conversation . Tried to bite chunk out of doctor 's nose , shouting ' I really want to kill you ' There was so much blood paramedics could n't tell if Dr Davis was alive . Tewkesbury given hospital order and minimum prison sentence of nine years .
Benjamin Pettitt attacked Dr Robert Davis at Tewkesbury home in May 2012 . The 33-year-old had taken cocktail of cocaine , heroin and anti-depressants . Became paranoid , believing a group of Frenchmen were coming to kill him . Attacked Dr Davis with a bat after 15 minutes of 'rational ' conversation . Tried to bite chunk out of doctor 's nose , shouting ' I really want to kill you ' There was so much blood paramedics could n't tell if Dr Davis was alive . Pettitt given hospital order and minimum prison sentence of nine years .