From that first body Gérard Labuschagne knew he had a serial killer. He knew from the way the schoolgirl had been hog-tied with her own clothing and dumped near the Telkom water tower in Sunnyside.Labuschagne's prediction was right. Over the next nine years the killer would leave at least five more bodies across Pretoria. His death trail was confirmed by the DNA he left at crime scenes.In 2013 he left his last body and went quiet. The schoolgirl killer might be dead, in jail, or Labuschagne believes, has possibly left other bodies that haven't been linked through DNA.Not being there when the killer is caught will be one of Labuschagne's regrets.Labuschagne packed up his office on the fourth floor of Pretoria's General Piet Joubert building on Monday . Earlier that day he had handed in his resignation letter, ending 14 years in the police's Investigative Psychology Section, which he had come to head.He is leaving because he is frustrated by management duties."I was no longer looking forward to work, those 12-hour meetings," he said. "I can't expect the organisation to change, so I must leave."The management duties came with his promotion to brigadier. That admin stuff kept him away from the killers, the rapists and other criminals he had joined the cops to help catch.There is also the issue of pay. Psychologists in the SAPS earn far less than their peers in other government departments because the police did not implement the Occupational Specific Dispensation.So he leaves a unit where he has assisted in the investigation of more than 110 serial murders and 200 serial rapists. The unit has never lost a serial trial.Labuschagne intends starting his own company to assess and manage threats in the workplace. He hopes still to have a hand in police work, helping to train psychologists...