>> pelley: deputy zack parrish hit the door. >> parrish: sheriff's office!> riehl: what's your name?! ( gun shots ) >> parrish: back up, back up! get out! get out! get out! shots fired! shots fired! he's down. hey, i'm going in! cover me! >> pelley: in a 96-minute shootout, five officers were hit. riehl's bullets flew through walls and wounded two neighbors. ( gunfire ) >> we've got three officers hit. one down! >> pelley: deputy zack parrish was killed, leaving a wife, a four-year old and an 18-month- old. matt riehl died with 19 legally- owned firearms including assault rifles, a combat shotgun, and pistols. he had fired 185 rounds. he had 1,067 left. >> tony spurlock: we had been dealing with this individual for almost two months. we had done a lot of things to try to intervene. but there were no tools available to us to do that. >> pelley: the casualties douglas county sheriff tony spurlock suffered made him a leading advocate for the red flag law which allows law enforcement to ask a judge for" an extreme risk protection order." the order requires a gun