(Portland, OR) -- A 60-year-old man has been sentenced to 40 years in prison for the kidnapping, sexual assault and deadly beating of a 19-year-old woman near Mt. Hood Community College in 1980. In 2021, new DNA technology identified Robert Plympton as a possible suspect. He was 16-years-old when the murder happened. Detectives saw him spit a piece of gum on the ground. A DNA test matched Plympton to the crime. He was living in Troutdale at the time and was arrested. A Multnomah County judge found him guilty of the murder.