Surgeon arrested for Ohio murders. Au pair testifies against former lover. Plus, 911 behind the scenes.

An arrest in the Ohio double murder has made headlines. Surgeon Michael David McKee is accused of killing his ex-wife, Monique Tepe, and her new husband, Spencer. In Virginia, former IRS agent Brendan Banfield is on trial for allegedly murdering his wife and a stranger. His former lover -- the family au pair -- testifies against him. Plus, a trial date has been set for alleged Gilgo Beach serial killer Rex Heuermann. And an expert gives us the lowdown on 911 calls. Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com