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Killer Genes

Killer Genes

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Host Melissa McCarty is an Emmy nominated investigative journalist with more than 20 years of true crime experience. Covering both solved and unsolved cases, She traveled the country confronting accused and convicted killers while also shedding light on the heartache violent acts cause. What sets her apart is the compelling storytelling and unique access to the people involved in each case which gives a 360-degree view of the crimes told directly from the source: the victim, their loved ones, experts, law enforcement, and the killers themselves. Melissa had two friends murdered at a young age and lost her brother suddenly and recently, giving her space to personally understand grief and violence.

© 2025 Killer Genes
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    • Determined: Life Without Free Will (What That Means for Criminals)

      Determined: Life Without Free Will (What That Means for Criminals)
      Nov 5 2025
      If every choice you’ve ever made was never yours what does that mean for guilt, justice, or redemption? From the moment of conception to prenatal stress, genes, and early environment, each begin shaping who we become. Neuroscientist Dr. Robert Sapolsky explains why we have no free will, why testosterone doesn’t cause aggression, how our biology and upbringing script our behaviors long before we act—and why the concept of free will may be nothing more than a comforting illusion.

      It will put into question everything we believe about punishment and morality. If no one truly chooses their actions, how should society deal with criminals? Is there room for compassion within accountability when biology writes the story of our lives?

      This conversation challenges the foundation of justice itself—and asks whether understanding could one day replace blame. Stanford neuroscientist and bestselling author Dr. Robert Sapolsky breaks down the science behind his book Determined: A Science of Life Without Free Will.
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      1 h
    • Before the Suitcase: 86 Calls for Help | Heather Mack Story

      Before the Suitcase: 86 Calls for Help | Heather Mack Story
      Oct 25 2025
      Sheila von Wiese-Mack called the police eighty-six times before her daughter killed her. Each time, it was a cry from inside a house where love had turned into fear. Months later after the last call to police, Heather Mack, would fly with her mother to Bali for what was supposed to be a healing trip—and end it with a body in a suitcase, a pre-meditated plot with her boyfriend. The couple had a secret, one that would spare the teenager the death penalty.

      This episode unravels the years of control, violence, and silence that led to one of the most shocking mother–daughter murders in recent memory. From Oak Park, Illinois to a luxury hotel in Bali, “Before the Suitcase: 86 Calls for Help” exposes how a bond meant to protect became the one that destroyed them both, plus Heather Mack's video confessions from prison she posted to YouTube.

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      28 min
    • Toxic Delusion: The Murder of Sophie Lionnet

      Toxic Delusion: The Murder of Sophie Lionnet
      Oct 16 2025
      A young French au pair came to London chasing language lessons and adventure—then vanished into the twisted paranoia of the couple who employed her. When neighbors saw black smoke rising from a garden, firefighters uncovered a horror so bizarre it defied belief. This episode unravels how a shared delusion, jealousy, and control turned a home into a torture chamber, exposing the dark psychology behind folie à deux and the cracks in the system that failed Sophie Lionnet.
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      28 min
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