Conversation so far:
When did Walt Disney become ill?
Disney had been a heavy smoker since World War I. In November 1966, he was diagnosed with lung cancer and was treated with cobalt therapy.
Were the Walt Disney's cobalt treatments successful?
No, on November 30 he felt unwell and was taken to St. Joseph Hospital where ten days after his 65th birthday, he died of circulatory collapse caused by lung cancer.

Question: What happened after he died?
Self-contained rewrite: What happened after Disney died?