Collision Course

Michelle Warner had been living with her ex-boyfriend, Mark Castellano, when she vanished in 2012. Castellano claimed she stormed out after a fight, leaving behind their three-year-old son. Castellano was interviewed by Dr. Phil McGraw on his daytime talk show regarding Michelle' ...  Show more

Prosecutor Steve Tauzer was found brutally murdered in his Bakersfield, California garage. At first, investigators suspected a revenge killing by drug dealers. But as they dug deeper, they turned their focus to Chris Hillis, a former police officer, colleague and friend of Steve ...  Show more

A healthy, young mother mysteriously dies after a minor traffic accident triggering an investigation to find out what caused her death.To learn more about how HLN protects listener privacy, visit cnn.com/privacy Learn more about your ad choices. Visit podcastchoices.com/adchoices ...  Show more

In this Dateline classic, after a fatal car crash, investigators find a series of revealing text messages that lead them to believe it may not have been an accident. Keith Morrison reports. Originally aired on NBC on November 11, 2011.

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A highway patrolman was dispatched to what he thought would be a routine traffic accident... until he looked in the car. While he had no formal training in forensic science, he had seen hundreds of accidents - but never as much blood as this. He was shocked by the coroner's rulin ...  Show more

A new father is found dead on the side of a road.  Then the shocking stabbing of a young woman in broad daylight leads police on a high speed chase.  Investigators wonder: are these two chilling murders connected? Josh Mankiewicz reports.

Josh Mankiewicz and Keith Morris ...