VIRGINIA, Minn. (AP) — A man was charged Thursday with killing a woman 34 years ago on Minnesota’s Iron Range in a case that was resurrected with the help of genealogy database analysts.

Michael Allan Carbo Jr., 52, of Chisholm, was charged with second-degree murder, according to St. Louis County prosecutor Karl Sundquist.

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Agents from the Minnesota Bureau of Criminal Apprehension and Chisholm police arrested Carbo Wednesday after a state Bureau of Criminal Apprehension lab confirmed that his DNA matched DNA from the crime scene, according to officials.

Nancy Daugherty of Chisholm was last seen alive early on July 16, 1986. That afternoon, police conducting a welfare check found her dead inside her home. There was evidence of a struggle, and witnesses reported hearing a woman screaming early that morning.

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Investigators over the years interviewed and collected DNA from more than 100 people but were unable to find a solid lead.

Early this year, Chisholm police approached the BCA about providing a sample of the DNA evidence to a company that analyzes public genealogy databases. This month the company identified the man as a potential suspect.

Officers began surveillance of Carbo last week and surreptitiously obtained DNA evidence, which matched DNA at the scene, according to police. On Wednesday, investigators obtained a DNA sample directly from Carbo with his consent, and that sample matched, the BCA said.

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Carbo was expected in court in Virginia Thursday.

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