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KANSAS CITY, Mo. — It was the beginning of 1970. We were grappling with new civil rights laws, we were in the middle of a space race, and Woodstock just made a big splash in American culture.

There was a lot changing for Allen Thompson, too. A student at Westport High School, he was a member of ROTC and was looking ahead at joining the military after school. It was also the first day of classes for the new year.

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After school, he ran an errand with his mom. It was then that Allen Thompson found himself at the end of a shotgun barrel during an armed robbery.

50 years later, his sisters are left without a brother and no clue who killed him other than a shady description and a couple people of interest.

Hear from police about the challenges they face today with bringing closure to Thompson family in a cold case decades old.

About 40 percent of the murder cases in Kansas City are unsolved. Many of those cases are considered cold. FOX4 Crime Files takes an in-depth look at some of these cases, each one representing a life lost, and loved ones searching for answers.