Nearly 40 Years After College Student’s Stabbing Death, Genetic Records Lead to a Suspect

For nearly 40 years, the murder of a college student, Helene Pruszynski, stumped Colorado detectives. The cold case languished for so long that all but one of her immediate family members had died.
But then on Thursday, Ms. Pruszynski’s older sister, Janet Johnson, got a phone call: A prosecutor said homicide investigators had made a breakthrough thanks to advances in genetic genealogy and dogged police work.