Authorities have identified the two San Luis Obispo County residents who died after their vehicles collided this weekend on Highway 46.

The collision occurred just before 5 p.m. Saturday when Shirline Miller, 62, of Paso Robles, drove her westbound Lexus over the double yellow line in an attempt to pass the car in front of her, according to Officer Daniel Hall of the California Highway Patrol.

Miller drove into the path of an eastbound GMC Sierra driven by James Fenstermaker, 50, of Nipomo, striking the left front end of his SUV.

Miller was pronounced dead at the scene, while Fenstermaker died after being taken to Sierra Vista Regional Medical Center, the CHP said.

Hall attributed the cause of the crash to "unsafe illegal passing," noting that the Lexus was traveling at speeds exceeding the maximum speed limit of 55 mph.

Hall said it's too early to know whether drugs or alcohol were a factor in the crash. Toxicology screening results are pending.