Police said 40-year-old Hart was a passenger in his 1970 Plymouth Barracuda and his friend Jared Black was driving on Mulholland Highway, according to multiple reports. The driver reportedly lost control and veered off the road, crashing through a wooden fence and coming to a stop in a ditch.
The driver and another passenger in the car became trapped inside the vehicle, police said.
Photos of the scene obtained by TMZ showed Hart's blue car mangled on the side of the road. The roof was crushed from the crash. Police told the tabloid the driver had not been drinking.
Hart and the driver suffered "major back injuries," police said," and were taken to nearby hospitals. The second passenger was reportedly not taken to the hospital.