 He was to play defensive lineman for the Bills, owing to his 6-4 size, speed, and strength.Sestak was a starter in his rookie year and, until a series of knee injuries ended his career after the 1967 season, used his strength to dominate the line of scrimmage.Sestak was a three-time selection to All-American Football League teams and a unanimous All-AFL defensive tackle in three consecutive years; 1963, 1964 and 1965.