SIOUX CITY, Iowa (AP) – A February trial has been scheduled for a Sergeant Bluff man accused of head-butting his teenage son. The Sioux City Journal reports that 47-year-old Bradley Graff entered a written plea of not guilty on Monday in Woodbury County District Court. The charge is child endangerment causing injury. His trial is scheduled to begin Feb. 3.

Court documents say the incident occurred while Graff was practicing wrestling with his 11- and 13-year-old sons at his business, Wall of Fame. The documents say the older boy asked to stop practicing, but Graff threw him onto a mat several times and head-butted him. The documents also say Graff later stomped his son’s head onto the mat, giving the boy a bloody nose.