Conversation so far:
What title did Brock Lesnar win?
Lesnar was defeated by Velasquez for the title by TKO in the first round.
When did he lose this title?
October 23.
When did he retire?
Speculation about a return to MMA lasted until March 24, 2015, when Lesnar announced in an interview on SportsCenter that he had re-signed with WWE.

Question: Is he still with the WWE?
Self-contained rewrite: Is Brock Lesnar still with the WWE?