Due to health problems , Murtaugh retired after the 1971 season , and Virdon was named as his successor .
Virdon coached the Pirates as they won the 1971 World Series .
Due to health problems , Murtaugh retired after the 1971 season , and Virdon was named as Virdon 's successor .
Virdon coached the Pirates as they won the 1971 World Series .