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Former NFL QB Koy Detmer Replaces His Late Father, Coaching Legend Sonny Detmer, at Texas High School

Former Philadelphia Eagles QB Koy Detmer is following in his late father's footsteps. 

Detmer was hired as head coach at Somerset High School, located southwest of San Antonio. Detmer will take the reins at Somerset after his father, longtime coach Sonny Detmer, passed away in September at 76 years old.

The elder Detmer was one of the great offensive coaches in high school football. He spent over three decades as a high school football coach in the San Antonio area, amassing a lifetime record of 235-141-2 at Somerset, Mission and Southwest high schools. 

Sonny Detmer coached both of his sons in high school, and under his tutelage both young QBs rewrote Texas high school football passing records

Ty Detmer left Southwest High School with more than 8,000 passing yards and 71 touchdowns. Koy amassed 8,221 yards passing and 82 touchdowns at the QB at Mission High School. In his final high school game, Koy completed a then-national record 44 passes.

Ty Detmer went on to win the Heisman Trophy at Brigham Young University, and spent 14 total seasons in the NFL, serving as a backup QB to the likes of Brett Favre and Steve Young. Koy played at the University of Colorado, then spent nine seasons as the Philadelphia Eagles' backup QB. 

When his NFL career ended in 2007, Koy began his coaching career as offensive coordinator for his dad at Somerset.

It was a perfect entry spot into the coaching profession for the younger Detmer. Over the last five years, he has served as the head coach at Mission High School, his alma mater. Mission is also the hometown of NFL Hall of Fame coach Tom Landry. The district’s field is known as Tom Landry Stadium and is the only football stadium outside of Canton, OH that has permission to use the official Hall of Fame logo on the playing field.

Koy will take over his father's position at Somerset with an opportunity to extend his family's legacy. He'll be able to coach his son, Koal, who will be a senior QB for the 2021 season.

Photo Credit: AP/Scott Boehm



  • NFL Players and Legends
  • Coaching
  • High School Football