Conversation so far:
when did Bill Edwards (American football coach) die?
Edwards died in 1987.
what did he die of?
CANNOTANSWER.
was he a coach as long as he lived?
Edwards retired in February 1973 after 39 years as a coach and administrator and said he would concentrate on hunting and fishing.
when did he start coaching?
CANNOTANSWER.

Question: what was his greatest accomplishment?
Self-contained rewrite: What was Bill Edward's greatest accomplishment?