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Oklahoma linebacker Austin Box dies

Oklahoma linebacker Austin Box has died, a spokesperson for the Oklahoma City Medical Examiner's Office confirmed to ESPN.com on Thursday afternoon.

According to multiple reports, Box was found unresponsive at a house in El Reno and airlifted to a hospital in Oklahoma City, where he died.

He was being transported to the facility for an autopsy this afternoon.

Box, a senior, was expected to be the Sooners' starting middle linebacker next season and had played three seasons at Oklahoma.

Oklahoma officials declined comment when reached on Thursday afternoon.