Court documents indicate that DNA processed in Maine led police to their suspect.
Steven Downs, 44, of Auburn has been charged with sexual assault and the murder of 20-year-old Sophie Sergie in April 1993.
According to Alaska state troopers, Sergie was stabbed multiple times, shot in the head, and found dead inside a dorm bathtub at the University of Alaska in Fairbanks.
Downs was a student there but grew up on Davis Avenue in Auburn
Down's parents did not want to be interviewed on camera but said they were in shock from the news of their son's arrest.
Court documents said investigators were able to connect Downs to the case after his aunt used a genealogical database.
The Maine State Police crime lab was able to match that information to DNA from the Alaska crime scene.
Alaska state troopers said they worked with the Maine State Police to arrest Downs in Auburn on Friday.
Neighbors living near his childhood home said they were happy that Sergie's family is able to get justice after a 25-year mystery