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A retired corrections officer mysteriously dies from antifreeze poisoning in rural Ohio. Detectives uncover multiple suspects during a five-year investigation that causes two families to collide. Josh Mankiewicz reports on a case that pivots on riveting medical evidence.

A night of Halloween drinking ends with tragedy when Joel Lovelien is killed at a bar GUESTS: Heather Eastling; Judy Salo; Alexa Lovelien; John Packett; Bill Mackey; Mike Sholes; Travis Stay; Nancy Yon; Bryce Larson; Joe Friedberg

A beloved grandmother was found brutally murdered in her home in January 2014. Peggy Nadell's tragic homicide then led the authorities on a chase for the people responsible. NBC News' \"Dateline: The Evil to Come\" delves into the circumstances surrounding Peggy's murder and how the police uncovered a sinister murder-for-hire plot orchestrated by someone within the family.

Sometimes it looks as if Houston, Texas, just goes on forever, sprawling all the way to the horizon. This was also the setting of a sprawling crime, one that began on a quiet Sunday night with a young woman named Gelareh Bagherzadeh. January 15, 2012, she'd stopped by her boyfriend Cory's house for a surprise visit. Just past 11 PM, now heading home, Gelareh wound through the streets of Houston's Galleria neighborhood. As she drove, she chatted on the phone with her friend Robeen Bandar.

This Friday night already felt like rain. Now it sounded like trouble. It was 10:47 PM. The woman calling 911 sounded desperate. She was on a cell phone, somewhere on the outskirts of town. Seconds later, the call dropped out. What was she running from, and what had happened on this Texas country road? Those questions would be answered quickly. was the why and the secrets that answer dragged out of the darkness that were so much harder to comprehend. Not that night, not on September 9, 2016 according to the running, gasping woman on the phone--someone had been shot. It was happening in Royse City, Texas, thirty-one miles from Dallas.

A long stream of events rushing by. Most barely make a ripple. But a few, like the sudden loss of a close friend, a child, or a parent, have a way of circling back upon us in a ceaseless loop of memory and regret. That's the way it's been for John Heckel and his sister Alicia Talbot ever since that completely normal morning in 1991 when their mom, Kathy Heckel, kissed them goodbye, left for work and never returned.

A romantic Mediterranean cruise intended to rekindle the love between a woman and her ex-husband leads to her vanishing; the investigation reveals secret recordings, a surprising star witness and an undercover hit man. GUESTS: Toshi Kanesaki, Carolyn Kanesaki

Christina Morris was afraid of the dark. It was something she never really got over. And it wasn't just the dark that scared Christina. It was what might happen in the dark. From early childhood, Christina Morris' fears didn't slow her down. Christina's parents divorced when she was a baby. She grew up in suburban Dallas with her dad, Mark; her stepmom, Anna; and a brother and sister. But she remained close to her mom, Jonni McElroy. was almost like Christina had two moms; and lots of friends.

After 27-year-old Jonathan Crews dies mysteriously in his Texas apartment, his family takes matters into their own hands in an effort to find answers.

In a network exclusive, Kristin Smart's parents sit down with Josh Mankiewicz following the arrest and conviction of their daughter's killer.