Fmr. co-worker of the Colorado shooter: Holmes was "good, had no incidents and had patience."

Gabriel Menchaca who worked with Holmes in 2008 at a summer camp says Holmes was "shy and quiet ... but he was actually a nice guy." Menchaca said when it came to working with kids, Holmes was "good, had no incidents and had patience."

Holmes' former co-worker went on to say that  he was shocked when he found out Holmes' was the Colorado shooter that claimed 12 lives at an Aurora theater this past weekend.  Menchaca said he thinks its something that happened to him in the last 4 years that would make him do a big change like that and he had no clue that later on he would be "a murderer, a killer."