Sue visits Behrman , telling him that Johnsy , who is dying of pneumonia , has come to believe that she will die when the last leaf falls off of the vine outside her window .
Sue visits Behrman , telling him that Johnsy , who is dying of pneumonia , is losing her will to live . 
 Sue tells Behrman that Johnsy claims that she will die when the last leaf falls off of the vine outside her window .