Edna Jackson was reported missing on Monday after she was last seen Sunday in the 100 block of Cypress Station Drive.
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Harris County sheriff's deputies said Jackson had dementia and was non-verbal.
In an update Monday afternoon, deputies said Jackson was found dead in a car in the parking lot of an apartment complex in the 100 block of Hollow Tree Lane, about half a mile from where she was last seen.
Deputies said surveillance video showed Jackson enter the vehicle at 4:30 a.m. Monday.
However, deputies said the vehicle she was found in was not at that location in the parking lot during the 9-hour search for her.
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She was found dead in the vehicle around 2:30 p.m.
An autopsy will determine the cause and manner of her death.
Deputies do not suspect foul play.