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A band onstage when the shooting started. panicked people trying to seek cover, hiding wherever they could. more than a dozen people were injured and when it was over, three people were killed, including this little boy, 6-year-old stephen romero. the 19-year-old gunman was armed with an assault-style rifle. he cut through a fence to get past security and metal detectors. tonight, police are now looking at his social media posts. some of them including what authorities describe as white supremacist messaging. abc's will carr leads us off from gilroy, california, tonight. >> reporter: in a spli...

A deadly and chaotic scene in wisconsin. a firefighter shot and killed by the man he was trying to help. body cam video showing the man was revived from a suspected drug overdose, arguing about going to the hospital when he suddenly pull that had gun. here's erielle reshef. >> reporter: tonight, newly released body camera video capturing that deadly encounter in wisconsin. >> whoa, whoa, whoa! [ bleep ] >> reporter: it started on a bus. paramedics reviving reuben houston with narcan for a suspected overdose. moments later officers repeatedly urging him to go the hospital. >> do you have any we...

He just missed. i got taken to the hospital here. they took me out and stuff like that. and i think it was like 35 stitches and two plastic surgeries, so i was furious. i wanted to get back at inmates, i wanted to kill inmates. i wanted to get them back. but i didn't. they're not worth doing time over. they're not worth losing your job over. it's not worth it. >> even though alejos is a veteran officer, every day at san quentin is unpredictable. his survival tactic has been never to show fear. >> it's like the law of the jungle, only the strong survive here. and if they see, that you're afraid...

They took me out and stuff like that. and i think it was like 35 stitches and 2 plastic surgeries, so i was furious. i wanted to get back at inmates, i wanted to kill inmates. i wanted to get them back. but i didn't. they're not worth doing time over. they're not worth losing your job over. it's not worth it. >> even though alejos is a veteran officer, every day at san quentin is unpredictable. his survival tactic has been never to show fear. >> it's like the law of the jungle, only the strong survive here. and if they see, that you're afraid, they'll eat you alive. so you never, never let you...

And i think it was like 35 stitches and 2 plastic surgeries, so i was furious. i wanted to get back at inmates, i wanted to kill inmates. i wanted to get them back. but i didn't. they're not worth doing time over. they're not worth losing your job over. it's not worth it. >> even though alejos is a veteran officer, every day at san quentin is unpredictable. his survival tactic has been never to show fear. >> it's like the law of the jungle, only the strong survive here. and if they see, that you're afraid, they'll eat you alive. so you never, never let your fear show, never. you have convicted...