(12) What did Crazy Addie do to himself in the beginning of the book?

From the text:

"Once the town was terrorized by a series of morbid nocturnal events: people’s chickens and household pets were found mutilated; although the culprit was Crazy Addie, who eventually drowned himself in Barker’s Eddy, people still looked at the Radley Place, unwilling to discard their initial suspicions."

Crazy Addie drowned himself, and died . . . why'd you ask?