A Cincinnati man has pleaded guilty to murdering a Whitehall girl 37 years ago. 72-year-old Robert Meyer made his plea in Franklin County Court this morning. He was arrested last year for the murder of 17-year-old Karen Adams, who went missing in 1975 while walking to a friend's house. Her body was found in a ditch the next day in Blacklick. Police say she was murdered after being sexually assaulted. Investigators with the Ohio Bureau of Criminal Identification and Investigation say there were able to match Meyer's DNA with semen found on Adams' body.