>> pelley: they'd met the resident, mathew riehl, before. >> matt riehl: rape! rape!> pelley: with each dispatch, deputies were reminded riehl was mentally ill, hostile and armed. >> parrish: if you keep yelling like that, i will take you to jail for disorderly conduct. >> pelley: he hadn't been violent, but that morning, he'd live streamed threats and talked of guns. >> riehl: yes, i-- i do have some weapons. i own firearms. i have been, you know, i have, i've had some scotch. >> pelley: deputies believed riehl was suffering a mental breakdown. >> riehl: they were stalkin'. why are they knocking? they are still knocking. >> pelley: riehl hadn't broken the law, so deputies could only take him into protective custody for a mental evaluation. instead, riehl barricaded himself. >> riehl: go away! >> parrish: open the door! >> i warned you! identify! >> 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 goin