It happened around 7 a.m. on the 1800 block of Ark Road in Hainesport, in Burlington County.
Dispatchers say the tree fell and crushed the car on the roadway, and helicopter footage from sister station WPVI in Philadelphia showed the vehicle severely damaged.
Authorities said 71-year-old Christine Roemer, of Indian Mills, was pronounced dead at the scene.
She was a passenger in the vehicle being driven by 71-year-old Albert Roemer Jr., who was was seriously injured and is now in the hospital.
Neighbors who live nearby said they heard the tree fall, and that it was loud.
They also said Public Service Enterprise Group (PSE&G) regularly trims some of these trees on the road, and that they were in the area recently.
The road was blocked to traffic as police investigated on Tuesday morning. It has since reopened.
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