In pretrial hearings for Bryan Kohberger, unsealed court documents reveal chilling texts sent by the roommates of four murdered Idaho students. The family of a young woman murdered in New York wants to know why the arrest of her suspected killer took so long. And we've got an update on the investigation into a student who went missing from a beach in the Dominican Republic. Plus, what's fair game when attorneys call on expert witnesses?

Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com

A California jury hears chilling details about the murder of hairstylist Fabio Sementilli from the man who admits he helped kill him. In Kansas, the lead detective on a double murder case is called to the witness stand by the woman charged with the murders. She's representing herself. We've got the latest on the investigation into the death of Hollywood actor Gene Hackman. Plus, NBC News' Vicky Nguyen is back with tips on how to avoid travel scams.

An officer goes undercover with an alleged killer in the Hollywood hair stylist case. We're listening in. A woman's third murder trial in three decades is underway. This time, she's acting as attorney and defendant — and cross-examining her own children. We've got updates on Karen Read and Adnan Syed, and a verdict in Hawaii. Plus, the latest on a new texting scam targeting drivers. Find out more about the cases covered each week here: www.datelinetruecrimeweekly.com