for beating his wife and his stepson intentionally. cracking his stepson's skull. he was court-martialed and imprisoned. had they turned that over to the fbi, he might not have been able to pass the background checks to purchase guns recently. the air force had launched a review into how the service handled the shooter's criminal record. tonight at this hour there are still 15 people in the hospital wounds related to yesterday's shooting. five of them are minors. some are still in critical condition. tucker, back to you. >> tucker: what a gruesome and awful story. investigators were able to find a lot about the sutherland spring shooter, devin patrick kelley, almost immediately. why were they able to put the pieces together so fast? in las vegas, we still know so little. we turn to dan, who joins us live.