The unidentified woman was found in the backseat of the SUV where the tree landed. Rescue teams reportedly tried to remove her from the car and render aid, but the woman was pronounced dead at the scene.

The woman was the only person inside the vehicle at the time the tree fell, police said. She was at the California park with family members, although it is not known if any of them witnessed the accident.

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"My heart, and the heart of our city, goes out to all impacted by Sunday’s tragedy at Pearson Park," Anaheim Mayor Ashleigh Aitken," said in a statement. "With sorrow and sympathy, our thoughts and prayers are with a family that has lost a loved one in this unthinkable time."

Crews worked into the evening to remove the tree, KABC reports.

It's unclear what caused the tree to fall.