Sasha Reid, a PhD candidate in developmental psychology at the University of Toronto and specialist on serial homicide, told VICE one aspect of McArthur’s case that stands out is his 2003 assault conviction for beating a man with a metal pipe.
“In my research, almost 80 percent of serial killers I’ve studied had a prior conviction for assault or sexual violence,” she said. Pickton was charged with attempted murder in 1998 after he stabbed and nearly killed a female sex worker who escaped his farm.
“Nobody wakes up one day and is a serial killer,” added Jooyoung Lee, an associate professor of sociology at the U of T who also researches serial killers. There’s a gradual process, he said, “where initially people engage in fantasy behaviours, where they begin to think about harming others and they begin to experiment and flirt with the idea that they might actually do it.”
Over time, he said, the impulse becomes so strong, the killer will act on it.