FLAG CITY — A third person has died following the Highway 12 crash on Tuesday morning that killed two women, the San Joaquin County Sheriff's Office reported.

FLAG CITY — A third person has died following the Highway 12 crash on Tuesday morning that killed two women, the San Joaquin County Sheriff’s Office reported.

Anton William Sievers, 82, of Rio Vista, was seriously injured in the crash and taken to San Joaquin County General Hospital, where he succumbed to his injuries.

The San Joaquin County Coroner’s Office identified the two other victims as 27-year-old Christina Annette Rodgers of Stockton and Lareta Mae Sievers, 83, of Rio Vista.

According to the California Highway Patrol’s preliminary investigation, the crash happened when Rodgers lost control of her black sport utility vehicle while trying to pass traffic.

The crash was reported about 9:30 a.m. Tuesday just west of Interstate 5 where Highway 12 heads out toward the Delta.

Sgt. Kyle Plant said witnesses reported seeing Rodgers’ SUV westbound on Highway 12, passing traffic across the double yellow lines when she lost control. The SUV spun out and ended going into the eastbound traffic lanes and into the path of a red Chrysler Town & Country minivan, he said. The SUV, which was sideways, was broadsided by the minivan before it continued down an embankment, where it came to a stop.

Plant said Rodgers was wearing her seat belt, but she was ejected from her vehicle. She was pronounced dead at the scene.

Lareta Sievers, who was in the minivan’s front passenger seat, also suffered fatal injuries and died at the scene, according to authorities. Anton Sievers, who was driving the van, was taken to a hospital.

According to the CHP, a pregnant woman who was sitting in the back of the minivan was also injured and transported to the hospital. Her condition is unknown.

Contact reporter Almendra Carpizo at (209) 546-8264 or acarpizo@recordnet.com. Follow her on Twitter @AlmendraCarpizo.