A Casper man is denying that he fired off several rounds from a gun at a Halloween party.

Eighteen year old Nicholas Frederick entered not guilty pleas on two counts of aggravated assault.

Casper Police say Frederick and 19-year old Kelly Smith were at a party last Halloween on the 1100 block of South Jackson Street.

Frederick got into an altercation with the host, who told officers that Frederick later pulled out a gun and fired one shot, grazing his head.

Witnesses told investigators that Smith drove off with Frederick, who fired off several more shots as he was leaving.

He was picked up about a month later in Colorado.

Frederick is being held on $250,000 bond awaiting trial and could face up to 10 years in prison on each count if convicted.

In an interview with police, Smith said she did not hear the gun go off, but officers later found several shell cases on the road and one in her vehicle.

She was charged with accessory after the fact.

Investigators say they believe she was trying to hinder the investigation into Frederick's actions that night.