Kouri Richins' ex-lover gets emotional. Twist in Microsoft employee's murder case. Plus, Josh Mankiewicz.

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 Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.