dating betts, broke it off, after what she calls several red flags. he talked about mass shootings and world tragedies like i talk about television shows. reporter: abc news has also learned of a now deleted twitter account believed to be linked to betts, describing himself as a an anime fan, a metalhead and a leftist. in less than 30 seconds, dozens were hurt. nine people killed. 25-year-old nick hummer had spent the summer working with cancer patients. he d just been offered his dream job. he s going to leave a big hole in our organization, for sure. i think he s left a hole in our hearts. do something! reporter: ohio s governor, who was drowned out by a crowd in the wake of the shooting, now says he s calling for legislation requiring background checks for nearly all gun sales and other reforms. we must do something. and that is exactly what we are going to do. and eva pilgrim joins us live