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.

Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

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Lester Holt talks with Josh Mankiewicz about his episode, “The Prince, The Whiz Kid, & The Millionaire.” After retired art dealer and Palm Springs socialite Cliff Lambert vanished in 2008, investigators uncovered a plot by a group of grifters that ended in murder. Lester and Josh discuss the mistakes the killers made leading up to their arrests and are joined by Dateline producer David Ketterling to talk about how he captured the essence of Palm Springs on camera. They play a podcast-exclusive clip from an interview with an opera singer who had a run in with one of the conspirators and discuss the pros of doing interviews in cars. Plus, they answer your questions from social media.

Listen to the full episode of “The Prince, The Whiz Kid, & The Millionaire” on Apple: https://apple.co/46Pk4hk

Listen on Spotify: https://open.spotify.com/episode/1AEZRIusS9zJoxkahTV6KJ

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Josh Mankiewicz reports on the disappearance of a retired art collector and Palm Springs socialite, one of the longest and most expensive missing-persons investigations in California history.

Lester Holt and Josh Mankiewicz go behind the scenes of the making of this episode in ‘Talking Dateline’

Listen on Apple: https://apple.co/3KRANrJ

Listen on Spotify: https://open.spotify.com/episode/14LQbM2c3BfJKWavoNBzcm

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When 2-year-old Nikki is rushed to a Texas hospital and doesn’t survive, her father, Robert Roberson, is accused of causing her death. Prosecutors say he shook and beat her in a case of "shaken baby syndrome."

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Attorney Gretchen Sween takes on Robert's case and pieces together Nikki’s overlooked medical history.  She tracks down a witness from his trial who has new information.

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As Robert Roberson’s execution nears, his attorney uncovers critical evidence and unlikely new allies, including Texas lawmakers and the detective who helped put Robert on death row. 

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Days before Robert Roberson's scheduled execution, his lawyer scrambles to save his life. The Texas Court of Criminal Appeals weighs in.

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In Texas, a verdict in the trial of the woman prosecutors say poisoned her fifth husband. In Manhattan, Sean Combs is sentenced to more than four years in prison by a federal judge. Updates in the Karina Cooper, Ghislane Maxwell, and Brian Walshe cases. Plus, Lester Holt joins us to talk about the case of Robert Roberson, a Texas man scheduled to die by lethal injection on October 16th. But a growing chorus of voices is urging the state to take another look.

Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

Listen to The Last Appeal: www.nbcnews.com/thelastappeal

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Blayne Alexander talks with Keith Morrison about his episode, “The Bucket Hat Mystery.” In 2022, acupuncturist Jon Tokuhara was found shot inside his Hawaii clinic. The investigation into his death revealed a complicated story of love, jealousy, and control that eventually led to the conviction of Eric Thompson, the husband of one of Jon’s former lovers. Blayne and Keith discuss reporting the story in Hawaii and the creative ways the team came up with to tell it. Plus, they dive into how security footage and a fallen bucket hat became key pieces of evidence. They also share part of Keith’s interview with a juror who describes what went on inside the deliberation room, and answer viewer questions from social media. 

Have a question for Talking Dateline? DM us @DatelineNBC or leave a voicemail at (212) 413-5252. Your question may be featured in an upcoming episode.

Listen to the full episode of “The Bucket Hat Mystery” on Apple: https://apple.co/46GHHIU

Listen on Spotify: https://open.spotify.com/episode/37LkgPcls7fYdQAaNRuiCt

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When acupuncturist Jon Tokuhara is shot dead in his clinic, investigators uncover a tangled love life and several persons of interest -- until security video reveals an unexpected suspect. Keith Morrison reports.

Blayne Alexander and Keith Morrison go behind the scenes of the making of this episode in ‘Talking Dateline’

Listen on Apple: https://apple.co/48RGVdk

Listen on Spotify: https://open.spotify.com/episode/3ZbIM8EQBuMkvQwuSKPbv5

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