Oklahoma State football coach Mike Gundy announced defensive coordinator Glenn Spencer will not be retained on Thursday afternoon.

Spencer came to Stillwater in 2008 as a defensive line coach and then was promoted to linebackers coach the following year. He promoted to defensive coordinator in 2013.

In the release, Gundy said he was “appreciative for the 10 years of loyal service that Glenn Spencer gave Oklahoma State.”

The Cowboys’ defense was fifth in total defense in the Big 12 last season.

With OSU finishing with 10 wins for three consecutive years – a program first – the defense was clearly the weak link. The Cowboys ranked 99th (2015), 92nd (2016) and 79th (2017) nationally in total defense.

Oklahoma State ranked 85th in scoring defense this past year, allowing 29.4 points per game. In the pass-happy Big 12, the Cowboys ranked 60th in opponents’ passing efficiency while ranking 38th in rushing defense (140.7 per game).

Prior to the 2017 season, Oklahoma State ranked third in the nation with 39 non-offensive touchdowns since 2010 and were third in America with 200 turnovers forced since 2010. Only Houston and Oregon had forced more during that time span. This past season, the Cowboys had three defensive touchdowns and 24 takeaways.

Spencer’s 2015 Cowboy defense was among the most disruptive in America, ranking in the top 10 nationally in turnovers gained, defensive touchdowns and quarterback sacks and also ranking among the top 20 nationally in tackles for loss, passes intercepted and fumbles recovered.

Three times during Spencer’s time on staff (2008-present) has Oklahoma State ranked in the top five nationally in turnovers gained (2010, 2011 and 2013). The Cowboys of 2011 led the nation with 44 turnovers gained.

A 2013 nominee for the Broyles Award given to the nation’s top assistant coach, Spencer’s defense ranked third in school history in yards per pass attempt defense and third in pass efficiency defense.

Before coming to OSU in 2008, he spent the previous three seasons as assistant head coach, recruiting coordinator and defensive backs coach at Duke.

Prior to Duke, Spencer coached the defensive line at Georgia Tech in 2002 and 2003 and served as the Yellow Jackets’ running backs coach in 2001.

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