Cobby worked in Sydney and commuted daily from her home in Blacktown. On the day of the murder, she finished work at Sydney Hospital at 3 p.m. and met friends for dinner in nearby Redfern. Cobby then caught a train from Central railway station to Blacktown station. Arriving at Blacktown, she would usually ring her father who would pick her up. On the day of her death, she most likely decided to walk home after finding the phone to be out of order and no taxis available at the taxi rank. Aside from her killers, only two witnesses saw Cobby after she left the train station.