A 84-year-old man has been arrested for a cold case murder from 50 years ago after he was linked to the case with genetic genealogy, authorities said.

The cold case ... was arrested Thursday after he “confirmed his involvement” in the vicious stabbing of Mary Schlais, whose body was found at a Spring Brook intersection in February 1974.

Katherine Kolodziej, 17, was reported missing 50 years, her body found, murdered, almost a month later on Nov. 28.

Police in Boulder, Colo., shared an update last week on the cold case murder of 6-year-old JonBenét Ramsey as the 28th ...