In January 1980, Helene Pruszynski, an aspiring journalist and Massachusetts college student, was in Douglas County, Colorado, to intern at a radio station. She had only been in town two weeks when she was killed.
Pruszynski was walking home from the bus stop when she was abducted, according to authorities. The next day her body was found in a field, partially naked.
The genealogists' identifications of family members helped investigators zero in on Clanton as the suspect.
In 1975, Clanton pled guilty to a rape at knifepoint, and served four years in prison.