Conversation so far:
When did Walt Disney become ill?
In November 1966, he was diagnosed with lung cancer and was treated with cobalt therapy.
Were the treatments successful?
on December 15, ten days after his 65th birthday, he died of circulatory collapse caused by lung cancer.
What happened after he died?
Disney's remains were cremated two days later, and his ashes interred at the Forest Lawn Memorial Park in Glendale, California.

Question: What commenced after his death?
Self-contained rewrite: What commenced after Walt Disney's death?