Conversation so far:
What are some interesting facts about the rookie carreer of Hoyt Wilhelm?
After pitching in the minor leagues, Hoyt Wilhelm was called up to a Giants team whose strong starting pitchers had led them to a National League pennant the year before
In what teams did Hoyt Wilhelm play?
Baseball pitcher Hoyt Wilhelm played with the New York Giants, St. Louis Cardinals, Cleveland Indians, Baltimore Orioles, Chicago White Sox, California Angels, Atlanta Braves, Chicago Cubs, and Los Angeles Dodgers
Did Wilhelm win any important tournament's statistical rankings?
Pitching exclusively in relief, Hoyt Wilhelm led the National League with a 2.43 ERA in his rookie year. He won 15 games and lost three
What about any other tournament's statistical rankings besides the National League's Earned Run Average, did Hoyt Wilhelm do well in any of those or anything that was voted for?
Wilhelm finished in the top ten in Most Valuable Player Award voting that season, becoming the first relief pitcher to finish that high
Did Hoyt Wilhelm lose any voting or come close during his rookie season?
Hoyt Wilhelm finished second in the Rookie of the Year Award voting.
Whats a name of a team member of Hoyt Wilhelm?
Sportswriter Bob Driscoll later attributed Wilhelm's difficulties in the mid-1950s to the decline in the career of Giants catcher Wes Westrum
Did Wes Westrum play for a MLB team?
Wesley Westrum played for 11 seasons as a catcher in Major League Baseball for the New York Giants from 1947 to 1957 and was known as a superb defensive catcher.

Question: When did Wilhelm retire?
Self-contained rewrite: When did Hoyt Wilhelm retire?