Texas State University suspended all activities at fraternities and sororities on Tuesday, following the death of a 20-year-old sophomore at an off-campus event hosted by members of a fraternity.



Matthew Ellis, a Phi Kappa Psi pledge, was found unresponsive on Monday morning after attending a private fraternity event at an apartment on Sunday night, authorities said. He was pronounced dead at the scene after EMS personnel were unable to revive him.



Authorities investigating the incident said alcohol may be a factor in his death and are awaiting autopsy results.



Following his death, President Denise M. Trauth suspended the activities of all fraternities and sororities at Texas State.



"These chapters are prohibited from holding new-member events, chapter meetings, social functions, and philanthropic activities until a thorough review of the Greek Affairs system is completed," Trauth said in a statement.



San Marcos Police Department found Ellis unresponsive and dead at the residence at 11:30 a.m. Monday.



Four of the individuals who lived at the apartment were fraternity members and Ellis was spending the night there, police said.



Initial interviews with the people at the scene indicated that they had been drinking Sunday night at a fraternity party, a police spokesperson said Tuesday, adding that "alcohol may be a factor" in Ellis's death.



Police said it was too early in the investigation to confirm if this was a hazing-related death. While no one has been arrested so far, police said charges in such cases could range from furnishing alcohol to a minor to manslaughter.



Texas State has been investigating Phi Kappa Psi since Oct. 4 following a complaint that was made against the fraternity on Sept. 21, Matt Flores, a spokesperson for the university, told BuzzFeed News on Wednesday. He did not provide details of the complaint, adding that the matter remains under review.



The Texas Alcoholic Beverage Commission (TABC) announced Friday that it was investigating the incident to determine "what role, if any, alcohol may have played in Matthew's death" and that it was working with local investigators to determine the source of any alcohol that may have been involved in Ellis' death.



"If it is found that alcohol played a role in this event, we will expand our investigation to identify any retailers who may have violated the law by selling to a minor or an intoxicated person," TABC Executive Director A. Bentley Nettles said in a statement. "These violations constitute an extremely serious risk to public safety, and TABC will punish any parties involved to the fullest extent of the law.

In a statement on Tuesday, the national organization for Phi Kappa Psi said the Texas State chapter had been suspended last week for "unrelated matters" and added that it would remain suspended during an ongoing investigation.



The fraternity did not disclose what the "unrelated matters" were but said it would "continue to work closely with the TSU administration and law enforcement during their review of this matter, and have advised all members to cooperate fully."



"We are heartbroken by the death of Texas State University student and Phi Kappa Psi new member Matthew Ellis," Phi Kappa Psi Executive Director Mark Guidi said in the statement. "Our thoughts and prayers are with his family, friends and the entire TSU student body during this difficult time."