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Gibbs coach Antonio Knox resigned Monday to focus on family issues, athletic director Javan Turner said.
Turner said Knox, whose teams went 3-7 each of the past two years, will remain a teacher at the school.
Knox, 29, played at Tuskegee University from 2002-05 and was an assistant coach there from 2006-08. In 2009, he was the defensive line coach at Gulfport High in Mississippi.
He was a defensive coordinator with the Gladiators when he took over the program in 2011. He had to battle numerous injuries to his players the past two seasons. In 2011, running back Emmanuel Stewart and quarterback Devontae White both tore their ACL. Last season, linebacker Maurice Hall was shot and missed the season.
The Gladiators failed to make the playoffs both seasons under Knox.
Knox also coached baseball but stepped down last season to concentrate on football.
Turner said he will post the opening on the Florida High School Athletic Association website on Monday and would like to have a coach in place as soon as possible.
“This wasn’t much of a surprise,” Turner said. “I knew this was coming. It was nothing he did that was wrong and there was no disciplinary action. Antonio just felt there were some things he needed to take care of with his family at this time and that would prevent him from coaching.”