In 1969 Twins manager Billy Martin elected to keep Walters on the team, and star player Bob Allison gave Walters the nickname "Big Shooter," which was later shortened to "Shooter." Walters pitched in six games in the major leagues, finishing with 6.2 innings pitched and a 5.40 ERA, 1 game finished, 6 hits, 4 runs, 4 earned runs, 1 home run, 3 base on balls, 2 strike outs and 1 hit batter.
In 1969 Twins manager Billy Martin decided to retain Walters on the team, and teammate Bob Allison gave him the nickname "Big Shooter," which was later shortened to "Shooter." Walters made a total of six appearances in the major leagues, finishing with a combined total of 6.2 innings pitched and an ERA of 5.40, including one completed game.