STOUGHTON, Mass. (AP) — A driver facing motor vehicle homicide and other charges in the deaths of a woman and her unborn child was ordered held Monday on $500,000 bail.

Authorities said Joanne White, 35, of Stoughton, was walking on a sidewalk Sunday night with her 11-year-old son when she was struck by a vehicle that backed out of a driveway on the other side of the street. White yelled to the boy to get out of the way just before she was hit by the vehicle, the Norfolk District Attorney's office said.

The victim was flown by helicopter to Massachusetts General Hospital where she and her unborn child were pronounced dead.

Karen Blau, 46, of Sharon, was arrested at the scene. She was arraigned on Monday in Stoughton District Court on charges including motor vehicle homicide, operating under the influence of liquor and drugs, and negligent operation of a motor vehicle.

Along with the $500,000 cash bail, Blau was ordered to have no contact with White's family.

Witnesses told police that Blau was looking for her own daughter when she backed out of the driveway of a home on Lincoln Street. The vehicle, still in reverse, went over a curb and on to the sidewalk on the opposite side of the street, where it struck White, who was about four months pregnant according to her family.

The vehicle also struck a tree, police said.

Blau's attorney, James Gavigan, said his client's car accelerated suddenly as she was backing up. He described Blau as distraught over the accident and said he would seek a reduction in her bail later this week.

Blau was scheduled to return to court on Aug. 14 and prosecutors said she could face additional charges.

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Information from: The (Brockton, Mass.) Enterprise, http://www.enterprisenews.com