Emotional testimony from a killer. A murder defendant's unusual defense. And travel scam safety tips.

Listen to this week's episode of the Dateline: True Crime Weekly podcast with Andrea Canning. 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. Find out more about the cases covered each week here:www.datelinetruecrimeweekly.com