A Webster City man accused of killing his father has entered a not guilty plea. 27 year-old Corbin Graesch entered the written plea Monday and also demanded a speedy trial. Graesch is facing a charge of first-degree murder in the death of his father, 61 year-old Steven Graesch. he is accused of beating his father using his fists and a blunt object during an altercation on June 7. An autopsy ruled the death a homicide by blunt force trauma. Graesch remains held in the Hamilton County Jail on $250,000.