FAYETTEVILLE, Ark. (AP) -- Arkansas coach Bobby Petrino says Razorbacks defensive coordinator Willy Robinson has resigned.
Robinson is the third Arkansas assistant coach to leave the school in the last two days. Former offensive coordinator Garrick McGee was named the Alabama-Birmingham head coach on Monday, and former special teams coach John L. Smith left to coach at Weber State.
Robinson led the Razorbacks defense for four seasons, coming to Arkansas after serving as the secondary coach for the St. Louis Rams. The 55-year-old also spent one season as the San Francisco 49ers defensive coordinator in 2004.
The Razorbacks were 72nd in the country in total defense in Robinson's first season in 2008, falling to 89th in 2009. They improved to 36th last season but fell to 51st this year, allowing 371.4 yards per game.