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LSU tight ends coach Eric Mateos runs onto the field during practice, Tuesday, September 27, 2016 at LSU's practice facility in Baton Rouge, La.

Eric Mateos turned his interim role into a full-time job.

Mateos, the graduate assistant who replaced Steve Ensminger mid-season as tight ends coach, is leaving LSU to coach offensive line at Texas State, a source told The Advocate. He's starting at his new position next week. 

Mateos, 27, just completed his first season with the Tigers, joining the program as a graduate assistant offensive line coach. After Les Miles' firing in September, he filled Ensminger's role as tight ends coach when then-interim coach Ed Orgeron promoted Ensminger to offensive coordinator.

A Kansas City native, Mateos landed his first full-time college coaching position after spending three years as a graduate assistant at Arkansas before his year in Baton Rouge.

He coached the offensive line, tight ends and served as recruiting coordinator for Hutchinson Community College in 2012. He began his coaching career in 2011 at Southwest Baptist University, a Division II school in Missouri where he played center and served as team captain.  

Mateos coached a tight ends group that came on after Miles' firing last season. Ensminger and new starting quarterback Danny Etling targeted the position, working guys like Colin Jeter, DeSean Smith and Foster Moreau into the game plan each week. 

That trio finished the season with 27 catches for 420 yards and three touchdowns. 

Follow Ross Dellenger on Twitter, @RossDellenger.