PITTSBURGH (AP) — A man whose pregnant fiancee was struck and killed by a van in a Pittsburgh parking lot says their son was born by emergency cesarean section and doctors are evaluating whether he was harmed by a lack of oxygen.

George Weatherwalk told reporters Thursday that the baby’s name is Trace Joseph Weatherwalk. The boy’s vital signs were strong, but he couldn’t breathe on his own at Children’s Hospital of Pittsburgh of UPMC, his father said.

Trace’s mother, 30-year-old Jodie Guthrie, was sitting outside a drugstore Wednesday afternoon when an elderly driver trying to park jumped a curb and pinned her against the wall, police said.

“Whenever she got struck by the car, the lack of oxygen that she lost, he also lost,” George Weatherwalk said. “So they’re saying they don’t know whether anything is wrong with his brain.”

Weatherwalk said doctors are keeping the boy’s body temperature low in hopes of preventing or limiting any brain damage.

Police Cmdr. RaShall Brackney said investigators believe the 88-year-old driver, Allen Massie, may have mistakenly hit the gas while parking, causing his car to jump the curb and pin Guthrie. Massie didn’t appear to understand witnesses who tried to get him to back up, possibly because he couldn’t see Guthrie, Brackney said.

Police said the accident remains under investigation and a decision on whether to charge Massie will be up to the district attorney. Online court records don’t list citations against Massie in Allegheny County.