Conversation so far:
What started Billy Southworth's career as a manager?
Billy Southworth's managerial career began in 1928 with the Rochester Red Wings of the AA International League (IL).
Was Billy Southworth a good manager to the Rochester Red Wings?
The Rochester Red Wings won the AA Internation League championship in 1928, Billy Southworth's debut season as a manager
What was Billy Southworth's strategy as a manager to the St. Louis Cardinals?
Only one year removed from being a teammate of his charges, Billy Southworth attempted to impose discipline on the Cardinals, banning them from driving their own automobiles.
Did Billy Southworth work with anyone of note?
What other teams did Billy Southworth manage besides the Rochester Red Wings?
Billy Southworth quit a coaching job with the 1933 Giants during spring training and left baseball for two seasons
Why did Billy Southworth quit as a coach for the 1933 giants?
Beset by struggles with alcoholism, Billy Southworth quit a coaching job with the 1933 Giants during spring training and left baseball for two seasons
Did Billy Southworth manager any other teams after he quit coaching for the Giants?
After a recovery, Billy Southworth rejoined the Cardinals' minor league system in 1935 and by 1939 he was again enjoying success as Rochester's manager.
What was Billy Southworth's most prominent moment as a coach for the Cardinals?
Upon Billy Southworth's appointment, the Cardinals won 69 of 109 games and jumped from seventh to third place in 1940. The following season they won 97 games and finished second.
Are there any other interesting aspects about Billy Southworth and his early career as a player-manager?
Billy Southworth finished with a .297 batting average in 1,192 MLB games played, 52 home runs, 91 triples, 173 doubles, 661 runs scored, and 561 RBI.

Question: Why was his playing career ending?
Self-contained rewrite: Why did Billy Southworth's playing career end?