BURLINGTON, Ky. (AP) — Nearly 50 years after a northern Kentucky teenager was found slain in a rural roadside ditch, investigators say they used advanced DNA testing to identify a suspect. The Boone County Sheriff’s Office began working the case of 16-year-old Carol Sue Klaber in 2017 after establishing a new cold case unit. Investigators said during a news conference on Wednesday that they believe former Park Hills resident Thomas W. Dunaway killed Klaber. Officials said Dunaway had a criminal history and died in 1990 at the age of 33. Klaber’s body was found in Walton in 1976 and Kentucky State Police worked the case for nearly a decade before it went cold.