The Phi Kappa Psi members and pledges are accused of setting a pledge on fire as part of a skit during a party last year

Four San Diego State University fraternity members pleaded not guilty Monday to criminal charges stemming from a skit that allegedly involved intentionally setting one of the defendants on fire, causing him to suffer third-degree burns.

The defendants, who were active members of the Phi Kappa Psi fraternity, allegedly hosted a party at their fraternity house on Feb. 17 of last year.