In Massachusetts, Brian Walshe comes face to face with his dead wife's lover in court. Prosecutors say the affair was Walshe's motive to kill his wife. Walshe says that's not true. Forty-three years ago in California, the body of Nancy Galvani was discovered floating under the San Mateo Bridge. For more than a decade, her daughter has suspected the killer was her own father. Last week, he was arrested. Updates in the cases of Luigi Mangione and the Gilgo Beach murders. Plus, NBC News legal analyst and defense attorney Danny Cevallos gives us the lowdown on juror misconduct.

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

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Keith Morrison sits down with Lester Holt and Dateline senior investigative producer Dan Slepian to talk about their episode, “The Ruse.” In August of 2018, Tom Perez Jr. called the Fontana, California, police asking for help finding his father. As police began investigating the case, they started to suspect Tom Jr. was hiding something — possibly involvement in his father’s disappearance. Over the course of 17 hours, investigators interrogated Tom and he eventually confessed to his father’s murder. But then, in an astonishing turn of events, Tom Perez Sr. turned up alive. Tom Jr. had confessed to a murder he didn't commit. Lester and Dan talk about the evidence that led police to believe Tom was guilty of a crime that hadn’t been committed, and the interrogation techniques that led to his false confession. Later, they play a podcast-exclusive clip from interrogation expert Steve Kleinman. Then, Lester and Dan answer your questions about the episode from social media.

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

Listen to the full episode “The Ruse” on Apple:https://apple.co/4pYP30T

Listen on Spotify:https://open.spotify.com/episode/1K4SvFqpY0tXhcCjVM0rAl

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When Tom Perez Sr. fails to return home after a trip to check the mail, Tom Jr. calls police — only to find himself the focus of their investigation until a stunning revelation upends the case. Lester Holt reports.

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