<sod >Police have confirmed that Devin Kelley, theÃÂÃÂ gunman who killed 26 and injured 20 in the Texas church mass shooting, also killed his grandmother-in-law.< eod>< sod > Police have confirmed that Devin Kelley, the gunman who killed 26 and injured 20 in the Texas church mass shooting, also killed his grandmother-in-law in the church.< eod>