Introducing a new investigative true crime series: "Radioactive: The Karen Silkwood Mystery." Karen Silkwood’s death 50 years ago this November continues to haunt Oklahoma and the nation. The 28-year-old plutonium plant worker died in a fatal crash while driving to meet a reporter with The New...

It began as a weekend of football, parties, late-night food and good friends -- a normal Saturday night in the college town of Moscow, Idaho. But Sunday morning, four University of Idaho students are found stabbed to death in their beds. Through friends, witnesses, video surveillance and social...