pack, long sleeves, and the back pack is weighted down t' not empty. there he goes. we know that he's been firing for a second because just past this umbrella is the taco stand on this street. that's where our first three fatalities occur. his sister. she heard the gunfire. you'll see on the right-hand side the path he walks. so he's engaging right now. that was the shooter that just went by. >> and, gary, are they saying whether the murder of his sister was intentional or -- do they know at this point? >> reporter: all right. so here are some of the key things we've learned including that, anderson. they do not know if he intentionally shot at his sister and his friend, killing her and wounding him. they don't know the answer to that question. it sercertainly is a puzzle. another thing we learned, perhaps the most important