>> reporter: it's interesting that the details that are emerging about the mental issues that aaron alexis has been struggling with in recent months seems to fly right into the face of what all his friends here in ft. worth saw up close. >> it's like dr. jekyll, mr. hyde. who was this guy? >> reporter: melinda downes spoke to aaron a week ago, saying there were no hints his friend was on the brink of launching a violent killing spree. >> you ask yourself, you go from denial to reality to fear to blame. is there something i could have done. is there something i could have saw, is there some type of behavior that i ignored or didn't see that i could have prevented this. but there is no answers.