The complex investigation into Margarette Ann Cuauhtli’s disappearance leads to an arrest and a conviction, but no sign of the missing teen.

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Margarette Ann Cuauhtli was weeks away from turning 17 when she was reported as a runway to Arlington police by her adoptive father in October 2001. But as the months go by, changing stories and a series of emails lead investigators to suspect something more sinister occurred.

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As Irving police continue their search for Megan Beth Johns' killer, friends and family members' suspicions are cast in various directions, including within. But investigators believe a bloody palm print holds the key.

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Megan Beth Johns had a passion for helping others struggling in life but could it have led someone to fatally stab the 29-year-old woman inside her Irving apartment on Oct. 5, 1994?

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Twelve years after the fatal shooting of Martin Munoz, an auto shop owner and married father of three (Ep. 4), a suspect goes on trial.

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On the morning of March 12, 1984, Dana Bowman was working alone inside a south Fort Worth slipcover shop when a man stabbed her repeatedly with a screwdriver, then ran. The 29-year-old seamstress called for help, but died hours later at a hospital.

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When her car stalled one April 1986 evening, Teresa Branch, 18, set off to jog the few blocks back to her parents' Arlington home for help. She never made it and was later found raped and murdered in a nearby church parking lot.

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Dallas County juvenile probation officer Ray Hernandez was compassionate yet cautious. Yet, in 2008, police say someone he knew stabbed him 46 times, then set his Grand Prairie house on fire.

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She let a late-night visitor into her Arlington apartment in January 2012. By morning, Irasema Chavez was found dead, stabbed more than 100 times.

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The dark shadow of crack cocaine followed her every step, but was her addiction the reason Felecia Johnson disappeared 24 years ago?

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