Well that was Mr.Arthur, dubbed infamously as Boo Radley, after carrying Jem back to his bedroom when he broke his arm fighting off that "Mysterious Attacker"
Physical Description of Boo Radley
Jem gave a reasonable description of Boo: Boo was about six-and-a-half feet tall, judging from his tracks; he dined on raw squirrels and any cats he could catch, that's why his hands were bloodstained—if you ate an animal raw, you could never wash the blood off. There was a long jagged scar that ran across his face; what teeth he had were yellow and rotten; his eyes popped, and he drooled most of the time
