Rockne Newell made the pleas to homicide and other charges Friday in Monroe County court.
A Pennsylvania man accused of killing three people at a municipal meeting in August has pleaded not guilty to homicide charges.
The two men who subdued the alleged gunman until police arrived are being called heroes Tuesday night.
Two people died at the scene, another was flown to the hospital but died of his wounds. A woman was in critical condition after undergoing surgery from her wounds.