(Warning: The video above may be considered graphic)A 17-year-old Chicago boy shot several times in the head was mistaken for dead and covered with a sheet until bystanders noticed him moving and told paramedics.Chicago Fire Department officials are trying to determine how the mix-up happened after the early Monday shooting that left one dead and five wounded.Paramedics eventually administered CPR to the boy, who was taken to Stroger Hospital in critical condition. The Chicago Tribune reports the boy, identified as Erin Carey, died more than 20 hours after he was shot. Carey reportedly laid underneath the sheet for an hour before people near the crime scene began yelling, pointing out his arms and legs were twitching. “He ain’t dead,” a woman cried.Fire Commissioner Jose Santiago said investigators are trying to piece together the decision making leading to the teenager being mistaken for dead."That individual has a catastrophic injury," said Chicago Police First Deputy Superintendent Anthony Riccio told WLS. "He was shot in the head and the prognosis is not good. I do understand that paramedics looked at him, believed him to be deceased, covered him with that sheet and moved on to another individual who was nearby who was also shot. They saw motion, movement underneath the sheet. Officers who were present notified paramedics, this man is still alive."Police say a woman whose name hasn’t been released was pronounced dead at the scene.They say the gunfire erupted after two cars circled a party near the University of Illinois-Chicago campus.Police said none of the surviving shooting victims are cooperating with investigators.