gunman in austin, friends and relatives, his high school principal and teachers saying the man, colton tooley a brilliant and model student. his emotions, they describe always in check, polite and respectful, never showed any signs of depression or aggression. his family clearly devastated to learn how he took his own life yesterday, crossing campus in a suit, a ski mask aimlessly firing a rifle into the air. >> walking over here and, had a black mask, and, i was looking and, hey, maybe he's joking. >> we heard loud pops and said, did you hear that, are those gun shots and she said i think i heard that. >> people screaming. >> and somebody with a gun, he has a mask, crazy guy. and it is just, just -- scared me. bill: police were on his trail and followed him into the library and he holed up and eventually turned the gun on himself, text messages sent to students with a warning, stay indoors and keep your doors locked. no one else yeared in that. we were watching it yesterday, a lot of fear, there was a second suspect and the story went on hours without conclusion and it is a sad conclusion no