In chapter 8, Nick mentions that a large crowd gathered outside George Wilson's garage as he steadily rocks himself on his couch while he processes the traumatic incident. Initially, four of five men, including Michaelis, stay with George in his office with the door shut before gradually leaving the garage to head home. Only Michaelis stays with George until dawn. Around three o'clock in the morning, George begins muttering about a yellow car that he saw and announces that he knows a way to track down the driver.
George also mentions that a couple of months ago his wife returned home from the city with bruises on her face. He then takes out a dog leash and begins whispering "Oh, my God!". George then tells Michaelis that Myrtle's lover killed her and he knows a way of discovering the man's identity. Wilson then mentions that he spoke to Myrtle about her affair and warned her that she could not fool God.
Michaelis ends up falling asleep after eating breakfast, and when he wakes up, George Wilson is gone. Wilson had traveled to Gatsby's home after receiving information that led him to believe Gatsby killed his wife. George Wilson then murders Jay Gatsby before he commits suicide on Gatsby's lawn.