THE STORY: Aaron, who attended elementary school in Compton, was going to a Halloween party in Inglewood, the grandfather said. Shannon said he saw two black males in their 20s walking in the alley behind the home in the Florence neighborhood. He said he nodded to acknowledge them. Shannon said he then heard a popping sound like small explosions or fireworks.When the gunfire stopped, Aaron was down. "My grandson was in a pool of blood in his Spider-Man costume. They shot him in the back of the head," Shannon said.