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02/15/2013 02:42 pm ET

Arianna Williams, Chris Dorner's Ex-Girlfriend, Not Surprised By Dorner's Actions (VIDEO)

Now that the body of Christopher Dorner, the ex-Los Angeles cop who had declared "war" on the LAPD, has been identified, many struggle to understand his horrific actions.

One person who knew him, his ex-girlfriend Arianna Williams, 33, said she is not surprised that Dorner snapped.

“When you have a profession where you worked your whole life to really obtain something in that level of success…when you go into that environment where everyone else is not lined up with the way you believe and the way you think…after time, the stress could probably wear on you,” Williams told CBS.

Dorner had written in his manifesto that his murderous spree was a "last resort" to expose corruption and racism within the LAPD and to restore his name after that corruption led to his firing in 2008.

He is accused of killing a retired captain's daughter and her fiance in Irvine, Calif., and shooting multiple cops in Riverside and Big Bear, killing two.

Williams continued, “I don’t think (that justifies) someone going out and killing anyone because they’re stressed out at work. Chris, unfortunately, was one of those people…he bottled up his emotions and wasn’t good at expressing himself.”

Some psychologists have blamed his narrow view of the world as one where right is always supposed to prevail over wrong. Others believe he may been suffering from post-traumatic stress disorder after being in the Navy or after being fired from the LAPD.

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