“After more than four decades, the suspect’s DNA was re-submitted for analysis in July 2020.
Ronald Albert Shroy’s DNA linked him to the crimes.
DNA from a cigarette butt reportedly narrowed the search down to one of two brothers living in Mesa, Arizona.”
Sounds like genetic genealogy was used although the article doesn’t mention it directly.
Never mentions if the perp was one of the people interviewed, either.
Wonder if he was on their radar and the cops dropped the ball.
Another article mentions use of genetic genealogy.
https://www.koin.com/news/crime/dna-helps-solve-1977-teen-murders-in-lane-county/
Or both were criminals with DNA profiles with law enforcement.