Texas Tech fired defensive coordinator Matt Wallerstedt on Thursday after the coach was suspected of being at the school's football building while under the influence of an unknown substance, sources told ESPN.com.
Wallerstedt was sent home from the facility Monday, according to a source.
The Red Raiders surrendered 438 rushing yards in a 49-28 loss to Arkansas last weekend, but the team's on-field performance was not related to Wallerstedt's dismissal, sources said.
CoachingSearch.com first reported the firing Thursday.
Wallerstedt joined the Texas Tech staff last season, coming over from Texas A&M along with head coach Kliff Kingsbury.
Wallerstedt is expected to be replaced by co-defensive coordinator and linebackers coach Mike Smith, who played for the Red Raiders and graduated from Texas Tech in 2004.
Smith will be Texas Tech's seventh defensive coordinator since 2007.
The Red Raiders are off this weekend, before traveling to play Oklahoma State next Thursday night.
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Unknown substance? Peculiar phrasing coming from the TTU sideādoesn't sound good.
I didn't know who he was until 2006. He would have been easy to miss in some areas of the country even though it was within the last 50 years. What did he do that was notable? To the best of my recollection he had two decent seasonsāgood seasons for Texas Tech considering the other seasons he was coaching...
Maybe they don't really need a coach but just someone to have the title of dc. Sounds like a government job. I'd be interested in going to Lubbock and it would only cost TT $150,000 a year. Now that's a bargin!
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