Police Chief Richard Biehl said while Betts had had several traffic violations, there was nothing in his history, no run-ins with the law or any other criminal behavior, that would indicate he was capable of a mass shooting.
Betts allegedly killed his own sister, Megan Betts, 22, in the attack, police said
Connor Betts drove a 2007 gray Toyota Corolla, according to WHIO, and parked it in a parking lot near Ned Pepper's, the bar he was targeting when he was shot and killed by police before making it inside.
Betts was wearing a mask, body armor and hearing protection when he headed for the bar late Saturday night, WHIO reported.
Betts was armed with a .223-caliber rifle and had double drum magazines that held hundreds of rounds of ammunition, police said.
The gun was ordered online from Texas, and Betts allegedly picked it up from a local Dayton dealer.