Updated

A newborn boy was abducted from his screaming mother after she was repeatedly shot outside a suburban Houston pediatric center on Tuesday, according to investigators searching for the suspected shooter who sped off with the infant in a blood-stained Lexus.

Montgomery County sheriff's officials said the mother, 28-year-old Kayla Marie Golden, was killed.

Golden was walking to her pickup truck after a checkup with her 3-day-old son, Keegan, when she had a verbal altercation with a woman in a Lexus parked next to her, sheriff's Lt. Dan Norris said.

Witnesses said the woman repeatedly shot Golden, took her infant and sped away, hitting the dying mother as she screamed "my baby" and tried to reach into the Lexus, Norris said. They reported hearing as many as seven gunshots and said a man also was in the Lexus, which is blood-stained on the driver's side, Norris said.

The infant was wearing a green-and-white one-piece outfit displaying the word "handsome."

The shooting happened just after 2 p.m. outside the Northwoods Pediatric Center in Spring, which is about 20 miles north of Houston. A statewide emergency alert has been issued for the baby.

Witnesses described the shooting suspect as a thin, gold-haired black woman, apparently in her late 20s or early 30s, Norris said. They also said the Lexus was sky blue or light green.

Joshua Jesson said he was in the clinic with his girlfriend when he heard gunshots. He said he saw the Lexus next to the pickup truck, then later looked back and saw the car was gone and a woman lying in the spot where the Lexus had been parked.

"I thought she just passed out. Then somebody ran in here and said, 'Somebody got shot,'" he said.

Police surrounded the clinic and part of the parking lot with crime-scene tape. The clinic is in an area thick with strip malls.

Golden's red truck sat next to yellow markers where spent ammunition cartridges and other evidence was found.