tuesday morning, everyone i'm andrew denberg norwood. rhiannon is on assignment. we begin with the questions being raised after that deadly mass shooting in texas. as we learn more about the suspects troubled past, we're taking a closer look at why we've seen so many mass shootings recently and what's fueling this anger? experts say it coincides with a sharp increase in domestic terrorist activity. we spoke to a former homeland security official who served in the trump administration to get some answers on this but first the new details from texas. this morning, the hero cop credited with ending the texas mall massacre is said to be doing well. in a new statement, his attorney said. the officer is a brave servant with a gentle heart and embodies the best alone force mint profession has to offer. the shooting unfolded saturday, an officer was heard saying he successfully took down the gunman minutes earlier. investigators say the gunman opened fire with an assault style rifle, killing eight people. two families lost multiple loved ones, including the choux family.