Conversation so far:
When did Red Grange start his NFL career?
On November 22,1925 Red Grange signed with the Chicago Bears.
Did Red Grange win his NFL debut game?
Red Grange's debut NFL game ended in a scoreless tie.
What happened after Red Grange's debut NFL game?
In the next game against the Columbus Tigers, Red Grange threw a touchdown pass and recorded 171 yards as the Chiacgo Bears won 14–7.
When did Red Grange join the Giants?
What other games were important in Red Grange's career?
In the 1933 championship, Red Grange made a touchdown-saving tackle that saved the game and the title for the Chicago Bears.
Did Red Grange win other championships besides the 1933 championship?

Question: When did his career end?
Self-contained rewrite: When did Red Grange's playing career end?