Mark Sievers fights death sentence. Miami model accused of murder. Plus, John Wayne Gacy mini-series.

Dateline NBC

  • Oct 16, 2025
  • 28:06
  • Full Episode
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Dennis Murphy drops by to talk about the latest in the case of Mark Sievers, sentenced to death for murdering his doctor wife. He is trying to convince a judge to give him a new trial. A pre-trial hearing for the model and social media influencer who says she fatally stabbed her boyfriend in self-defense. Plus, you've heard of serial killer John Wayne Gacy — but what do you know about his victims? A new drama series from Peacock takes a closer look.

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Brief Summary

Courtney Clenny's murder trial and Mark Seavers' case reopening are discussed, along with updates on other crime stories.

Key points

  • Mark Seavers' Alibi. Mark Seavers claims he was three hours away when his wife was murdered, raising suspicions.
  • Courtney Clinney's Self-Defense Claim. Influencer Courtney Clinney claims she stabbed her boyfriend in self-defense, but evidence contradicts her story.
  • Donna Adelson's Sentencing. Donna Adelson, convicted of murder, claims innocence during her emotional sentencing.
  • New Series on Peacock. NBC News Studios presents a new series available on Peacock, focusing on the Gacy case.
  • The Victims' Stories. The show focuses on the victims and their families, rather than just Gacy.
  • Detective Tovar's Haunting Reflection. Detective Tovar shares the weight of unresolved cases that still haunt him.

Tension

65/ 100Some tension

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