In Fort Worth alone, there are upward of 900 unsolved cases - mostly murder mysteries - that date back to the 1950s.
Some of the cases are eventually solved, but most just go cold.
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Out of the Cold is Produced by Steve Wilson, edited by Steve Coffman and written and narrated by Deanna Boyd
A call for help, a search for a killer
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.
A short jog home ends in murder mystery
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.
The dark shadow of crack cocaine followed her every step, but was her addiction the reason Felecia Johnson disappeared 24 years ago?
A savage beating and pleas for justice
More than 30 years later, family members are still haunted by the unsolved murder of Milton Hatchell, who was found beaten to death in a north Fort Worth neighborhood, a vicious attack that police said left his face "virtually unrecognizable."
Part 2: A suspect’s history of violence
Since Cheryl Springfield was murdered on Christmas Day 1980, one man remains as a suspect. But Barry Dean Kelly, who is serving a life sentence for the murder of another woman, insists he had nothing to do with Cheryl’s death.
Part 1: Murder under the Christmas tree
With her young son and a niece sleeping nearby, Cheryl Springfield was killed on Dec. 25, 1980 and left near the Christmas tree in her home, the cord of an iron wrapped around her neck. Her case remains unsolved.
Arrest made in father's murder
A Mexican national imprisoned three times for illegally entering the U.S. is accused in the 2007 fatal shooting of Martin Munoz, a beloved husband and father of three.
Martin Muñoz, an auto shop owner, worked hard so that his three children could have opportunities that he didn't. But a dispute over a tire rim left him dead and his family still heartbroken more than a decade later.
A grandmother's mysterious murder
Margarett Terry had endured a life filled with heartache, burying two children and a husband. If life was fair, she would have died peacefully. Instead, she was murdered inside her home, a crime that remains unsolved - 28 years later.