Head coach Mack Brown announced Sunday former Longhorns defensive coordinator and Syracuse coach Greg Robinson will return to the team to take over Diaz's performance.
“Our performance on defense last night was unacceptable, and we need to change that,” Brown said.
Brown hired Diaz in 2010 after Texas finished 5-7 and lost defensive coordinator Will Muschamp to Florida.
Brown called Diaz -- who had been defensive coordinator at Mississippi State for just one season -- a rising star who brought energy and fresh ideas to the struggling Texas program.
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