Facebook / Brie Aguilera

The Texas A&M student who was found dead after the school's football game against the University of Texas died by suicide ... according to the Austin Police Department.

Remember ... Brianna Aguilera -- a 19-year-old student at the university -- was found outside a campus apartment complex around 1 AM Saturday, hours after A&M's 27-17 Friday night loss against rival Texas. Facebook / Stephanie Rodriguez

Detective Robert Marshall of APD says she was found with trauma from an apparent fall from a high floor. Cameras showed Brianna arriving at the apartment building around 11 PM Friday before heading up to a 17th-floor apartment.

A large group left the building around 12:30 AM Saturday morning, cops say ... leaving Brianna and three other women in the

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