Investigators using DNA and genetic genealogy have identified a man whose remains were found more than 40 years ago in southwest Minnesota.

The Rock County Sheriff’s Office and the Minnesota Bureau of Criminal Apprehension announced Tuesday that the remains found in March 1981 were those of Louis Anthony Gattaino of Omaha, Neb.

The agencies said Gattaino was the victim of a murder, but did not say how he died. He was 25 years old when he went missing in October 1971, nearly 10 years before his skeletal remains were found near a culvert along Interstate 90 near Beaver Creek, Minn.

“While it’s not news anyone wants, Louis Gattaino’s family at long last has some answers,” Rock County Sheriff Evan Verbrugge said in a news release from the two agencies. “And while there is still much to be learned about Mr. Gattaino’s death, knowing his identity — even decades after he died — is a critically important new clue in this case.”

An investigation after the remains were found in 1981 had failed to determine their identity. The sheriff’s office and BCA said forensic scientists had obtained DNA from the remains, but that DNA did not match anyone in convicted offender or missing persons databases.

Then, in August, researchers from the…