steven mathieson , 38 , stabbed prostitute luciana dozens of times in a frenzied and unprovoked attack .
as she lay dead on the floor , the father-of-two called two more vice girls over to his family home and raped them before they managed to flee while still naked .
mathieson , who has previously been described as of ` impeccable character ' , pleaded guilty to murder and rape at the high court in glasgow today and now faces life in prison .