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A former nurse turned FBI profiler interviewed dozens of killers. She explains what the most dangerous ones have in common.

Former FBI profiler Candice DeLong spent two decades investigating crime. She explains why some killers stop after one murder while others keep going.

  • Former nurse Candice DeLong interviewed dozens of killers during 20-year FBI career
  • Most dangerous serial killers had lack of guilt as common trait after first murder
  • Childhood trauma played role, but pivotal moment was reaction to first murder

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