The Story Of California's Mass Shooter
The angst leading up to the evening of horror was years in the making.
Elliot Rodger was frustrated by troubles such as his height, his parents' divorce and his lack of success with women -- and wrote 140 pages detailing as much.
After chronicling his years of perceived misfortune, he picked Friday as the day to launch a killing rampage.
It appears that Rodger was planning the killing spree "for at least a year," Brown told CNN on Sunday morning.
For more on this story, visit Holly Yan, Ralph Ellis and Sara Sidner (CNN).