33-year-old Andrew Pray entered his plea Monday before Portage County Circuit Judge Thomas Eagon, who ordered a competency exam
Pray is charged with first-degree intentional homicide in the May 26 attack. The victim, 77-year-old Chris Bonnstetter, was removed from life support and died June 3.
Pray's mother told police Bonnstetter was laying on the floor in the living room and resting when her son came upstairs and struck him three or four times. She said he "just flipped out."
Plover Police Officer Michael Tracy testified at a hearing last month that Pray only said "no comment" when Tracy asked him what happened.
Pray is due back in court Oct. 6.