'I know what makes A SERIAL KILLER'

Rachel's witnessed how murderers go from charming to deadly

- Harry Mulholland

Coming close to a terrifying serial killer is a staple of horror movies, but for Dr Rachel Toles, meeting some of the world's most dangerous killers is all in a day's work.

"I've come face to face with a lot of people who have murdered and the most frightening ones are the ones you'd least expect to be killers," she shares with Woman's Day.

"A lot of people who've been around a serial killer will say the killer's eyes would glaze over as they go in between these friendly and dissociative states."

For the last 12 years Rachel has worked with some of the world's worst serial killers to find out what behaviours and factors make a murderer.

"There's something about death that always drew me in," she shares.

"I've always wondered how a human could become like Jeffrey Dahmer."

Rachel's fascination with death and murderers began while visiting a movie set with her parents when she was just five years old.