Mark Dixie linked to sex attacks in Australia An Australian criminologist is calling for one of Britain’s most notorious sex killers to be investigated over unsolved crimes in Western Australia. Mark Dixie, 50, was jailed for at least 34 years over the 2005 stabbing murder and rape of 18-year-old model and hairdresser Sally Anne Bowman in Croydon, south London. Sally Anne, who was born in Carshalton and attended Cheam High School, was attending the Brit School in Croydon before she was murdered. He killed the young model by stabbing her multiple times and subjecting her to a horrific sexual assault. The father of three, who worked as a pub cook, finally admitted the killing to detectives in January 2015.