Anchored by Jake Tapper, The Lead airs at 4 p.m. ET on CNN.
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(CNN) – He didn't just "snap."
For three years, the Santa Barbara killer had been plotting what he called a "day of retribution," fantasizing in his journal about punishing "all of the popular kids and young couples for the crime of having a better life than me."
He also posted videos online, displaying his sickness and hatred of women.
Elliot Rodger's mother saw his latest video posts in late April, and called police to ask that they check on her son. Seven officers knocked on his apartment door. After an interview, they walked away, convinced he was not a threat.
But Rodger was violent. He'd been in several altercations with total strangers, bizarrely throwing coffee on both a group of girls that he felt spurned by and a couple kissing in a parking lot.
He even tried to push a woman off a 10-foot ledge in a drunken rage.
This is all according to his own writings and ramblings.
Now, after taking six innocent lives, this killer stands as a deadly example of what can happen when the warning signs go unnoticed, or potentially unheeded.
Forensic psychologist Kris Mohandie joins CNN's "The Lead with Jake Tapper" to discuss.