Surveillance video of Michelle Robey who was shot by Chicago police

The Chicago PD has released footage of a woman apparently attacking a CVS worker with a knife just before she was shot dead by police.
Cops shot Michelle Robey, 55, in North Center on the night of February 10, while she was acting erratically and dangerously inside and outside the drug store.
But Robey's sister says that there was no need for police to shoot the woman down, and is now suing them for using excessive force.
The footage released by the police is taken from multiple cameras and only shows the events before and after her shooting - not the death itself.
Camera in CVS show Robey throwing something at a cashier and shouting, before walking around shelves and knocking products onto the floor.
A worker attempts to block the exit with shopping carts, but Robey then approaches with what appears to be a knife and swings it at the woman's head.
The worker is able to fend her off and does not appear to be harmed. Robey then exits the store.
The two other videos, each taken from a passing bus, show two officers stood over Robey's body, a little down the street from the CVS.
Police say that Robey had been ranting in the bus stop outside the CVS when they were called at 5.45pm, according to the Chicago Sun-Times.
Officers say that she brandished the knife at them when they approached her, and that they attempted to stop her with a Taser twice, but it had no effect.
She was shot by both police after she lunged at one of them with a knife, they said.
Robey, who had a master's degree in psychology had raised her now-20-year-old son in Elgin, around 40 miles from Chicago, until around 2011, the Daily Herald reported.
While living there she worked in homeless shelters and hospitals, and was given the Elgin Image Award in 2008 for her services to the city.
'She was very generous and always had big ideas,' said Gail Cohen, who - as Elgin's human resources director - nominated Robey for the award.
'She wanted to solve world hunger.'
But in 2009 Robey began to show signs of mental illness, something that plagued her up until her death.
She had three encounters with Chicago police in January and was hospitalized and released each time. Her most recent diagnosis was 'bipolar with schizoaffective disorder.'
On March 28, Robey's sister, Anastasia, filed a suit in the US district court saying that the two officers, who were not named, violated her civil rights when they killed her.
Their actions were 'objectively unreasonable under the circumstances,' the suit contends.
It demands unspecified damages from the officers for excessive force, battery and wrongful death.