During the 1959 season after garnering two interceptions , Butler was forced to retire due to a leg injury he received when tight end Pete Retzlaff of the Philadelphia Eagles rolled into Butler 's knee .
In 1958 , Butler added nine more interceptions to his growing list .
During the 1959 season after garnering two interceptions , Butler was forced to retire due to a leg injury Butler received when tight end Pete Retzlaff of the Philadelphia Eagles rolled into Butler 's knee .
In 1958 , Butler added nine more interceptions to his growing list .