Conversation so far:
How did Billie Jean get started?
Billie Jean King learned tennis on the many free public courts in Long Beach, taking advantage of the free lessons tennis professional Clyde Walker offered at those courts.
Did Billie Jean King have any endorsements?
The palimony lawsuit filed by Marilyn Barnett caused Billie Jean to lose an estimated $2 million in endorsements and forced her to prolong her tennis career to pay attorneys.
Did Billie Jean King win any Grand slams?
Billie Jean King won 39 Grand Slam titles: 12 in singles, 16 in women's doubles, and 11 in mixed doubles.
Did Billie Jean King receive any formal awards for her talents?
Billie Jean King was inducted into the International Tennis Hall of Fame in 1987.

Question: When did she stop competing?
Self-contained rewrite: When did Billie Jean King stop competing?