Inside Edition Rides Along With Hero Who Chased Down Texas Gunman

We're learning more about the motive behind the Texas church massacre. The gunman's mother-in-law attended the First Baptist Church in Sutherland Springs. She was not there on Sunday when 26-year-old Devin Kelley opened fire on churchgoers inside. Neither was his estranged wife Danielle, but her grandmother was there and was among the victims. 55-year-old Stephen Willeford shot and wounded the gunman outside the church. Then he and a passerby, Johnnie Langendorf, gave chase.