To juror 4 what is the most convincing evidence that the boy is guilty?

Juror 4 finds the most convincing evidence against the boy to be the eyewitness testimony of the old man who claimed to have heard the boy shout and saw him fleeing the scene. He also believes the knife used in the murder, which was identified as unique, strongly implicates the boy. Additionally, Juror 4 considers the boy's background and previous run-ins with the law as further evidence of his guilt. These factors lead him to view the case as clear-cut and compelling.