A Rockwell City man has pleaded not guilty to accusations that he fatally shot a Rockwell City Police Officer last month. 32 year-old Corey Trott entered the written plea on Monday through his attorney Charles Kenville. Trott has been held in the Sac County Jail since September 13, when he allegedly shot and killed officer Jamie Buenting during a standoff situation. He is charged with first-degree murder. A trial date has not been set at this time.