Alex Murdaugh's murder convictions thrown out. A new search for Kristin Smart. Plus, AI and murder.

In South Carolina, Supreme Court judges make a pivotal ruling in the case of Alex Murdaugh, the disgraced lawyer convicted of murdering his wife and son. In California, police search for the remains of Kristin Smart, a 19-year-old college student killed in 1996, in the backyard of her killer's mother. In Dateline Round Up, emotions run high at the sentencing of Dale Warner, the Michigan man convicted of killing his wife Dee and concealing her body in a fertilizer tank. Plus, NBC News Senior Legal Correspondent Laura Jarrett discusses AI chatbots under fire in the courtroom. Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com