Robert Plympton was convicted of killing 19-year-old Barbara Mae Tucker An Oregon man who was linked to a 1980 cold case murder after his DNA was found on a piece of chewing gum was convicted of ...

Robert Plympton, 60, has been found guilty of first-degree murder, thanks to groundbreaking DNA genealogy technology and a discarded piece of chewing gum. Tucker, a student at Mt. Hood Community ...