How did Fred die in Scooby Doo on robot chicken?

In the Robot Chicken episode "Scooby-Doo, Where Are My Pants?", Fred is not killed. Instead, he gets turned into a human-sized Scooby-Doo by a mystical hat. This is a humorous take on Fred's leadership and his often-ridiculed portrayal as the "brainy" member of the Mystery Inc. gang.

There's no scene of Fred dying in that specific episode, and it's worth noting that Robot Chicken often uses satire and dark humor, so it's unlikely they would depict a character's death in a serious manner.