brave the line of fire to rescue his fallen partner. august 22nd, 2011. a sunny afternoon in el cajon, california, just outside san diego. 23-year-old free lance cameraman greg torkelson is listening to his police scanner. >> something happens. you know, a shooting, car crash, a house fire, something like that, i respond to it and i try to get the good shots. >> shortly after 5:00 p.m., greg hears about a man brandishing a gun inside a residential home. that man is 32-year-old kevin collier, despondent since his wife filed for divorce five days earlier. he had moved out, but now came back with a gun. when he discovers alissa is out, he instead shoots and kills their 14-month-old daughter riley and his mother-in-law. >> i had no reason not to be home. i should have been there.