A criminal sexual assault allegedly occurred on Saturday at about 6 a.m. at the Phi Sigma Kappa fraternity house, 1300 Blackhawk Road, and was reported to police on Monday, DeKalb Police said.

The alleged incident occurred at the Phi Sigma Kappa house, but there was not a social event there that night, said Mark Matthews, president of the Phi Sigma Kappa fraternity.

DeKalb Police Chief Donald Berke said there is no further information available except that the investigation is continuing.

Matthews said “the alleged perpetrator voluntarily dropped out of the house” on Monday.

“The member and the girl had been drinking and there was a fight,” he said.

“The member maintains he’s innocent and we (the fraternity) support him 100 percent,” Matthews said.

Matthews said the fraternity had a chapter meeting Monday night and the member and chapter felt the best act was for him to be expelled from the fraternity. The member is “now seeking living arrangements elsewhere,” Matthews said.

He said the 22-year-old member dropped out of the fraternity because he didn’t want negative images to come to the Phi Sigma Kappa house. The fraternity is on social suspension now for a fight which occurred last semester, Matthews said.

Matthews said the member has been troublesome in the past.

“The Phi Sigma Kappa fraternity apologizes to the community for this negative thing,” Matthews said. “We don’t condone actions of this sort.”