A dentist on trial for poisoning his wife. And detectives' doubts about the case of a Virginia dad accused of conspiring with his au pair.

Listen to this episode from Dateline NBC on Spotify. In Colorado, security video takes center stage at the murder trial of dentist James Craig. In the D.C. suburbs, a dramatic pre-trial hearing in the case of Brendan Banfield, accused of plotting to kill his wife and a stranger with the help of the family au pair. And verdicts for both former MLB player Dan Serafini and Iowa farmer's widow Karina Cooper. Plus, a former secret service agent on a scam involving fake cops.Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com Hosted by Simplecast, an AdsWizz company. See pcm.adswizz.com for information about our collection and use of personal data for advertising.