These small classes and lab work encouraged students to form tight friendships, but Mr. Holmes remained outside those inner circles for the most part, one person who took several upper-level classes with him said.

WSJ: Shooting Suspect's Behavior Provided Few Clues

Yet Nelson also estimates that in 2025 there will be a surplus of 22 million large-lot homes that will not be left vacant in a suburban wasteland but instead occupied by lower classes who have been driven out of their once affordable inner-city apartments and houses.

CNN: Is America's suburban dream collapsing into a nightmare?