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Update, 3 p.m.: Brazos County sheriff's investigators say a 20-year-old Sigma Phi Epsilon fraternity member attended a formal social event in Downtown Bryan the night before he was found unresponsive by his roommates.

Investigators continue to re-create Matthew Hayes' activities before his death, officials said.

After the event, Hayes returned to the Sig Ep house on North Graham Road in College Station, officials said Wednesday afternoon. He was last seen alive early Tuesday morning.

Hayes' fraternity brothers believed he was asleep in his room, officials said, but checked on him after he missed an event that afternoon.

The autopsy has been completed, and the Brazos County Sheriff's Office is waiting for the results.

Update, 12:30 p.m.: Staff members with the national Sigma Phi Epsilon fraternity are on the Texas A&M campus, coordinating with the university to provide grief support and counseling to Sig Ep members, a fraternity spokesman said Wednesday.

Andrew Parrish said the group was devastated to learn about the death of 20-year-old Matthew Hayes, who was found unresponsive in his room at the fraternity house on Graham Road.