Meet Detectives Molly Harris and Bobbi Olson — the two women of the Aurora Police Department Homicide Unit who investigated the case featured in Friday’s all-new Dateline at 10/9c on NBC. | Dateline NBC

A medical mystery was about to turn into a full-on police investigation… Tonight on an all-new Dateline at 10/9c on NBC. | Dateline NBC

Cheryl had a nagging feeling… Where was her daughter, Kelsey? The full story tonight at 9/8c on a classic Dateline. | Dateline NBC

You’re witnessing something highly unusual… Watch the full story tonight at 9/8c on a classic 2-hour Dateline. | Dateline NBC