Power window rolls up on and kills girl playing in parked car in Arizona

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3. "how it was the power window was activated. I'm guessing the key was left in"

"Courtesy Power-On:
Power windows work only when the ignition of the vehicle is on.
But some cars have a ‘courtesy power backup’ which is supplied to the window circuit even after the engine is turned off.

In case you forget to roll up your windows, this feature saves you from the hassle of turning your ignition on again, just to pull the windows up."

https://www.bankbazaar.com/insurance/motor-insurance-guide/power-windows-in-cars.html