(Portland, OR) -- A suspect in a cold case murder who was identified from gum he spit out has been found guilty. In 1980, the body of Barbara Tucker was found near Mt. Hood Community College. She had been kidnapped, sexually assault and beaten to death. In 2021, DNA that was found on her body was tested and a genealogy trace indicated Robert Plympton was the suspect. He lived in Gresham. Detectives followed Plympton and when he spit out his gum, the DNA was tested and matched the DNA on Tucker. In a bench trial, Plympton was found guilty of Murder in the First Degree. He'll be sentenced June 21st.