NEW : Lookout warned his team , then left post as prescribed , officials say . NEW : The FBI is investigating the incident and has not said if it will be expanded to include other agencies or individuals. 19 members of a `` hotshot '' team from Prescott died in an Arizona wildfire Sunday . McDonough was the only team member to survive .
NEW : Lookout warned his team , then left post as prescribed , officials say . NEW : The lookout , Brendan McDonough , departed hilltop post just before flames came . 19 members of a `` hotshot '' team from Prescott died in an Arizona wildfire Sunday . McDonough was the only team member to survive .