Conversation so far:
What can you tell me about Patterson vs Johansson?
Patterson met Ingemar Johansson of Sweden, the number one contender, in the first of three fights.
how did he do?
Johansson triumphed over Patterson on June 26, 1959, with the referee Ruby Goldstein stopping the fight in the third round.

Question: Why was the fight stopped?
Self-contained rewrite: Why was the June 26, 1959 Patterson vs. Johansson fight stopped?