Frost was hired as head coach ahead of the 2018 season. Josh Heupel replaced him at UCF.
The Cornhuskers also made assistant coaching staff changes on Monday.
Offensive coordinator Matt Lubick, offensive line coach Greg Austin, quarterback coach Mario Verduzco and running backs coach Ryan Held have been relieved of their duties immediately.
Held served as a defensive graduate assistant at Tennessee from 1998-99. He played for Nebraska from 1993-96.
Held served as Frost’s running backs coach at UCF from 2016-17.
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