The Colorado State University (search) chapter of a fraternity where a 19-year-old woman was found dead was dissolved Thursday after university officials said an investigation turned up violations of alcohol rules during the past year.

Samantha Spady (search), a sophomore business major from Beatrice, Neb., was found dead in a lounge at the Sigma Pi house Sunday evening. Police suspect drinking contributed to her death and have ruled out foul play. The Larimer County coroner had not announced the cause of death.

Investigators believe she had been dead for about 12 hours before a fraternity member found her body.

CSU officials said a university investigation revealed the fraternity chapter had violated alcohol rules by holding unauthorized parties, serving alcohol at the fraternity house and serving alcohol to minors.

CSU and the national Sigma Pi (search) organization in Brentwood, Tenn., dissolved the CSU chapter, with the support of the CSU Intrafraternity Council, the university said in a statement.

The CSU chapter had 18 members.