The Galveston County Medical Examiner ruled her cause of death as drowning and the manner of death as accidental.
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According to a police report, Hernandez left her friend's home in the 6000 block of Benning Drive around 2:30 a.m. on April 18. She then arrived at another friend's home around 2:58 a.m. and left at 4:05 a.m.
Body in car pulled from Pearland pond matches missing mom
Hernandez, a single mother to three children, was the subject of an intense search for weeks.
On May 11, her SUV was discovered in the small body of water at Reflection Bay and N. Clear Lake, in Shadow Creek Ranch. The Galveston County Medical Examiner's Office confirmed that the person found inside the vehicle was indeed Hernandez.
WATCH: 'It's not over' Family says after missing mom's car found in pond
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'It's not over' Family says after missing mom's car found in pond
Using video footage, police also confirmed Hernandez took a route consistent with the one she used to go home.
The sister of Hernandez spoke to the media at the site of the discovery saying the family felt numb and sick to their stomach.
SEE ALSO: Vehicle found underwater at Missouri City park is not tied to missing mom Erica Hernandez, HPD says
Vehicle possibly detected at park during search for mom