Wilson shot Gatsby while he was swimming in his pool. Wilson suspects Gatsby of killing his late wife, Myrtle, because he recognized the car model from the scene of the crime. However, Wilson doesn't realize that Gatsby wasn't driving; instead, it was Daisy driving, and Gatsby mentions to Nick that he knows Daisy meant to kill Myrtle. This is likely due to the fact that she knows her husband, Tom, has been having an open affair with Myrtle. Rather than allowing Myrtle to get caught for murder, Gatsby is willing to take the blame for the crime, proving just how much he loves her, despite the fact that Daisy more or less used him just to make Tom jealous of her for having an affair.