A man was convicted this afternoon of having killed a woman almost 30 years ago. After the jury conviction, a judge in Hamilton (Ohio) promptly sentenced 59-year-old Donald Korn to life in prison for the murder of 72-year-old Ruth Doench. Investigators said the retired school teacher and principal had been raped before she was found dead in July 1974 at her Fairfield Township home, where she had lived alone. Korn's first conviction for the killing was overturned on appeal. Butler County authorities re-opened the case four years ago with additional witness testimony and new DNA evidence against Korn. The judge ordered today that Korn must serve his sentence consecutively to a 25-year-to-life term he is serving in Indiana for raping and attempting to kill another woman.