Closing arguments underway in Blackwell trial

Closing arguments are underway today in Columbus in the trial of a nationally known marketing expert accused of insider trading. Prosecutors say Ohio State marketing professor Roger Blackwell told family and friends about the pending merger of Worthington Foods and Kellogg Incorporated when he was on Worthington's board in 1999. Worthington's stock doubled when the deal was announced. Prosecutors say Blackwell's associates made nearly 900-thousand dollars from the tip. Blackwell, four other people and a partnership he co-owns are on trial in federal court, accused of 48 charges ranging from insider trading to conspiracy.