A sudden moment of terror launches a frantic search for a costumed killer. Reported by Josh Mankiewicz, “Internal Affairs” is a story about bad choices, a fatal attraction and people who proudly wore badges at work -- while living lies at home. Follow now to get new episodes weekly, or subscribe to Dateline Premium on Apple Podcasts for early access and ad-free listening: apple.co/datelinepremium

A secret affair gets discovered, and a murder suspect gets cuffed.

When a wife and mother is murdered in Greeley, Colorado, responding investigators suspect the costumed killer is someone they know.

Choices about relationships, revelations and reconciliation set a murder in motion.

A detective plays cat and mouse with an unusual suspect, while crime scene evidence raises questions for investigators.

Recorded phone calls from a suspect in jail reveal the ties that bind unraveling.

A woman at the center of the case turns state’s evidence and the defendant takes the stand.

As a bonus for you, we’re sharing the trailer for Dateline: True Crime Weekly, an all-new weekly podcast series. Every Thursday Andrea Canning and her guests dive into the biggest crime stories of the week, bringing you the latest on trials and investigations around the country.

Listen to the first episode on Thursday, May 16 and follow now wherever you get your podcasts: https://link.chtbl.com/dtcw_fdtw