One of the two 15-year-old boys facing charges in that case is also under investigation in the unprovoked assault of Mark Smith, a 38-year-old man with an intellectual disability whose beating by juveniles was captured in a video that went viral Monday, a police spokeswoman said. The second 15-year-old charged in the assault on the principal is the brother of another suspect in the assault on Smith and may have been present for that assault as well, according to police.