No criminal charges will be filed after a University of Arkansas at Fayetteville student in September told police she was raped at an on-campus fraternity.

"After reviewing the evidence in the case, I have decided that there is not sufficient evidence to support a criminal charge. I will not be going forward with the case," wrote Brian Lamb, a deputy prosecutor in Washington County, in an email Wednesday.

The student told police an acquaintance raped her at the Sigma Nu fraternity house. Sexual assaults at the same fraternity house had also been reported to university police in November 2012 and in March, but prosecutors also declined to file charges in those cases.

In the 2012 case, a prosecutor reviewed the case and, in an email to university police, concluded that "it would be very difficult, if not impossible, to prove forcible compulsion in this case based on the victim's statement and lack of significant injury," according to a police report.

In the March rape investigation, Capt. Gary Crain with the university Police Department said the woman reporting a possible rape remembered "very little" because she was intoxicated. She "now believes it did not happen," Crain said last month.

Metro on 06/13/2014