The prime suspect in the murder of an American teacher in South Korea is speaking out for the first time. Carolyn Abel was killed in her apartment 30 years ago while teaching English in Seoul. The main suspect was not arrested and because of U.S. extradition laws, her alleged killer may never face trial. Peter Van Sant investigated her murder case for nearly three years. Watch his full report for "48 Hours" on Saturday night at 10 p.m. ET.