She was taken to Gleneagle, near Albany Highway in Bedfordale where she was raped again and strangled with a nylon cord. A 19-year-old female student came forward after the murders hit the news. David Birnie lost touch with Catherine, at least for a while. Ms Moir alerted authorities and the Birnies were sentenced to life in prison. He married his first wife during his early 20s and the couple had a daughter, Tanya, who was aged 10 at the time of his arrest. Paul Ferguson, a retired detective, said it would be an outrage if Catherine was ever released, The Birniesmurdered Sussannah Candy, 15, Denise Brown, 21, Mary Neilson, 22, and Noelene Patterson, 31 in the weeks prior to Ms Moir's abduction. . Picture Mogens Johansen Credit: The West Australian. [11] When the police arrived, she said she had been abducted at knifepoint by a couple who had taken her back to their house and raped her.