All fraternity and sorority chapter activities at Texas State University have been suspended after fraternity pledge Matt Ellis, 20, was found unresponsive Monday morning at an off-campus apartment.

According to a statement from university officials, the sophomore from Humble, Texas, had attended a party that Phi Kappa Psi fraternity members hosted Sunday night at the apartment.

He was pronounced dead after EMS personnel were unable to revive him.

The Phi Kappa Psi national office issued a statement, saying it suspended the Texas State chapter last week: “The chapter had been suspended by Phi Kappa Psi Fraternity, Inc last week for unrelated matters, and will remain suspended while the investigation continues. Phi Kappa Psi will 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.”

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

Police in San Marcos, Texas, about 50 miles south of Austin, said they suspect alcohol played a role in the student’s death. An autopsy has been ordered.

The university has now suspended all fraternity and sorority chapter activities during the investigation. University President Denise Trauth said that a review of the entire fraternity and sorority system on campus must be done before the chapters can be reinstated.

“As president of Texas State University, I am deeply saddened by the tragic death of one of our students who attended an off-campus social event on Sunday evening hosted by members of a university fraternity,” said Trauth. “My thoughts are with his family, friends, and the Texas State Community.”

She noted, “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. It is imperative that our entire university community develop a culture that places the highest priority on the safety of its students, faculty, and staff.”