Conversation so far:
Is Ali in the Ken Norton article referring to Mohammed Ali?
Ken Norton is best known for his trilogy with Muhammad Ali.
When did Ken Norton first fight Muhammad Ali?
On March 31, 1973, Muhammad Ali entered the ring as a 5–1 favorite versus Ken Norton.
Did Ken Norton win his first match against Muhammad Ali?
Ken Norton won a 12-round split decision over Ali.
What did Muhammad Ali say in regards to Ken Norton?
Muhammad Ali said during an interview with Mark Cronin, Kenny’s style is too difficult for me. I can’t beat him, and I sure don’t want to fight him again....

Question: When did he fight Ali again?
Self-contained rewrite: When did Ken Norton fight Muhammad Ali again?