Conversation so far:
what year was Ron \Pigpen\ McKernan born?
CANNOTANSWER.
Are there any other interesting aspects about this article?
He developed a close friendship with fellow keyboardist Tom Constanten based on their mutual aversion to psychedelics and.

Question: What happen with the keyboardist?
Self-contained rewrite: What happen with Ron McKernan and Tom Constanten, the keyboardist?