What does George Wilson do in order to figure out who killed his wife?

George Wilson, driven nearly mad by the death of his wife, is desperate to find her killer. Tom Buchanan tells him that Gatsby was the driver of the fatal car. Wilson, who has decided that the driver of the car must also have been Myrtle's lover, shoots Gatsby before committing suicide himself.

A 'sick man' as Nick describes him, he operates a ramshackle gas station in the ash heap. Oblivious to his wife's affair until discovering the dog collar Tom had bought for her, he goes mad with rage and locks her inside, declaring that he is going to take her away to the Midwest. After his wife's death he goes crazy and embarks on a shooting rampage, killing Gatsby and then himself.