Mom-of-three Kouri Richins stands trial in Utah for the alleged murder of her husband. Prosecutors call her ex-lover to testify and he weeps on the stand. In Florida, the man who confessed to gunning down Microsoft employee Jared Bridegan takes back his confession and guilty plea, potentially upending the case. In Dateline Round Up, a verdict in Dale Warner's trial for murdering his wife, plus new filings in the case of alleged Gilgo Beach serial killer Rex Heuermann. And Josh Mankiewicz gives a sneak peek of his new podcast, "Trace of Suspicion."

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

Start listening to "Trace of Suspicion" here: https://www.nbcnews.com/traceofsuspicion

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Keith Morrison and Josh Mankiewicz sit down to discuss Josh’s latest episode, “The Professor & The Poet.” Sue Marcum, a beloved accounting professor at American University, was found dead in her Bethesda, Maryland, home. When police tracked down her stolen car, they thought maybe her murder was the result of a robbery gone wrong. But DNA pointed to someone much closer to home: Sue's Spanish teacher and friend, Jorge Rueda Landeros. By the time authorities connected him to the crime, Landeros had fled to Mexico, where he lived and taught yoga for more than a decade before his arrest and eventual conviction.

Josh and Keith talk about the dangers of loving the wrong person and the importance of listening to your friends’ advice. Plus, Josh reminisces about his childhood in Bethesda and what it was like to go back there as a Dateline correspondent. He also shares an extra clip from his interview with the killer’s ex-girlfriend.

Listen to the full episode of “The Professor & The Poet” on Apple:https://apple.co/4rmNZ7k

Listen on Spotify: https://open.spotify.com/episode/6anAENlSGSqxdP08dFAUU8

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Hey Dateline fans! As a bonus, we’re giving you a special preview clip of our new podcast series, Trace of Suspicion.

After seemingly healthy 23-year-old Marine Todd Sommer dies unexpectedly, his widow Cindy’s lavish spending, cosmetic surgery, and wild partying raise investigators’ suspicions. They accuse her of poisoning him with arsenic for his life insurance, setting off a criminal case that takes a stunning turn... Josh Mankiewicz sits down with the woman at the center of it all in Dateline’s newest podcast.

If you like what you hear, just search Trace of Suspicion to listen to the first two episodes now, completely free. Or subscribe to Dateline Premium on Apple Podcasts, Spotify or DatelinePremium.com. Subscribers get early access to new episodes and can listen to all Dateline podcasts ad-free.

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