The murder of Michelle Martinko occurred in Cedar Rapids, Iowa, on December 19, 1979. It was a cold case until 2018, when familial DNA identified her killer 39 years after the crime.[2]. Martinko, , an 18-year-old high school student, was found stabbed to death in her family's car in the parking lot of a local mall, where she had gone to buy a new coat. The case gradually grew cold as the investigation stretched on.
In 2006, a cold case investigator discovered unidentified blood, presumably belonging to the killer, while he was reviewing case files. A DNA profile was developed from that evidence. In 2017, the DNA data entered into the public genealogy website GEDmatch, where it found a familial DNA match.
In October 2019, DNA was covertly collected from an Iowa man, Jerry Lynn Burns, and was found to match the sample discovered on Martinko's clothing.[2][3][4] Burns was arrested and, was found guilty of first-degree murder in the death of Martinko. On August 7, 2020, Burns was sentenced to life in prison without parole.[1][5]