he knew ruben ruiz's wife called and said she was inside dying. he knew a child called 911 and said she was in room 112 surrounded by victims. as the acting uvalde police chief mariano pargas was a commanding officer on scene and could have done something about it. >> shimon prokupecz joins us now. shimon, this is so stunning. i mean, this is such incredible work you've done. you spoke with the families about what you found. i can't imagine what their feelings are. >> i mean, you know, it's just, anderson, in all honesty, it's just disappointment after disappointment for them because they feel, again, they're not getting this full account of what's happening. and certainly they're very thankful to us for bringing this information to them. it's one of the hardest things to do in this story, really, besides trying to get all this information. but reaching out to these family members, every time we do this story and having to provide this information to them. and there's always the silence on the phone from them. then it takes a little while and they

>> reporter: moments layinger ruben ruiz, whose wife is a teacher delivered critical information to himd inside his wife's classroom. he was suspended by city of uvalde in july and placed on paid leave while they investigate his role as a commanding officer during the shooting is walking in and out of the hallway taking cover next to a wall. failing to organize a response. even when ruben ruiz barrels back into the hallway telling colleagues that his wife eva called him from inside the room and says she's dieing. >> hey, hey, hey. >> she says she's shot. >> reporter: it's the acting chief who comes and removes ruiz from the hallway. >> i don't know. you have to -- >> reporter: as time goes by the police on the scene can be heard looking to him asking him for direction. he want to know what the plan is. parghas tells his waiting on the department of public safety. >> just waiting for -- what's going on? >> something in there to come in. >> reporter: at 12:30 p.m. 30 minutes after police arrive 10-year-old chloe torrez, a fourth grader trapped inside the room with the gunman on the phone

even when ruben ruiz barrels back into the hallway, telling his colleagues that his wife eva moralesfrom inside of the room, and said that she's dying. >> ruben. >> she said she's shot. >> reporter: it is pargas, the acting chief who calms and removed ruiz from the hallway. as time goes by, the police on the scene could be heard looking to pargas, asking him for direction. they want to know what the plan is. pargas tells them he's waiting on the texas department of public safety. >> are we just waiting for -- what is going on? >> dps is coming in. >> reporter: at 12:10 p.m., nearly 30 minutes after police arrive, 10-year-old khloe torres, a fourth grader trapped in the room with the gunman, is on the phone with a 911 dispatcher. >> i'm in classroom on the -- 112. 112, yes. >>s what your name, ma'am? >> please hurry, there is a lot of dead bodies. >> cnn obtained that call and published it with the approval of her parents. when the dispatcher radio yoed the information pargas and other scenes are immediately informed. >> advising he is in the room full of victims. >> a child called 91