SAN ANTONIO – One person is dead after an early morning car accident on the northeast side.

The accident happened just before 5 a.m. Tuesday on access lanes of east bound Loop 410 and Austin Highway right under the Alamo Heights exit overpass.

A police spokesperson said a man in an SUV hit a guardrail on the corner and flipped over. A passerby pulled over to help and called the police but it was too late, the driver died.

Investigators have been on scene gathering evidence and it's not clear if alcohol was a factor.

Police will most likely remain on scene during the morning commute. Drivers might want to take an alternate route.