A driver was killed and his passenger was injured in a major rollover crash in north Harris County, deputies said.

According to reports, the driver of a small vehicle was headed north on Kuykendahl Road near Cypresswood when he lost control of the car around 2:15 a.m. Sunday.

Deputies said the car went into a ditch, flipped over, and slammed into an electrical pole.

The driver died on impact, and a passenger in the vehicle was taken to the hospital in an unknown condition.

No other vehicle was involved.

At this point, deputies said they are not sure what caused the crash.