Former Washington Redskins assistant coach Joe Bugel, regarded as one of the top offensive line coaches in NFL history, has died. He was 80.

Bugel died on Sunday, according to a statement from the team, which did not disclose a cause of death.

Bugel was the architect of “The Hogs,” the dominant offensive lines that helped lead the team to three Super Bowls under Hall of Fame head coach Joe Gibbs.