Retired FBI agent and criminal profiler Candice DeLong explores the disturbing case of David and Catherine Birnie, the Australian couple who terrorized Perth over five weeks in 1986, abducting, raping, and murdering five women before a survivor's extraordinary courage brought them down. Candice examines how David's history of violent sexual sadism and Catherine's lifelong terror of being left behind made them not just compatible, but catastrophic -- a partnership that turned shared damage into a killing spree that shook Australia to its core.Audible subscribers can listen to all episodes of Killer Psyche ad-free right now. Join Audible today by downloading the Audible app.

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When a shocking crime occurs, people ask “Why?” Was it about power, ego, or revenge? On Killer Psyche, retired FBI agent Candice DeLong draws on her decades of experience to reveal why these murderers and criminals committed these heinous acts. She will reveal fascinating new details about what drove these people, including cases she was close to. Candice will share specific psychological methods and profiling techniques that experts use to understand the deepest part of the most complex, fascinating, and twisted minds, from the Unabomber to Alex Murdaugh to Mary Bell. Winner of the 2025 Bronze Signal Award for True Crime podcasts.Audible subscribers can listen to all episodes of Killer Psyche ad-free right now. Join Audible today by downloading the Audible app.