Surveillance video released of bipolar woman who was shot by Chicago police

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CHICAGO. Ill., -- Surveillance video has been released of a woman who was shot to death by Chicago police.

Michelle Robey had bipolar disorder. One February 10th she created a scene at a CVS drugstore in North Center. Reports said that Robey knocked things off the shelves and repeatedly screamed and swore and threatened store employees with a knife.

Minutes later, police got a 911 call about a woman at a nearby bus stop, screaming randomly. Police tried for several minutes to subdue her with a stun gun and finally, shot her fatally in the abdomen.

The police department says the officer acted properly but Robey's sister is suing for excessive force.