A man is facing murder charges after police said he intentionally rammed a woman with his car and then ran her over.

Police said 53-year-old Janice Pitts was sitting at a traffic light on Wednesday, driving her daughter to work, when 23-year-old Dewey Green hit her Lincoln Navigator from behind.

“He just kept hitting us," said Pitts’ daughter, Iesha Davis. "He just kept hitting us.”

Davis was in her mom's SUV at the time with her 4-year-old son.

Davis said when her mom got out of the SUV to assess the damage, Green pinned Pitts between the two trucks.

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“I’m banging on the window, ‘Please, you're crushing my mom, you're crushing my mom! Please, you're crushing my mom,’" Davis said. "He wouldn't look at me. He kept his face straight and kept his foot down on the gas."

“Then he just backed up, and my mom's body dropped.” said Davis.

Witnesses say Green then went up over the median, came across a grassy knoll and ended up sideways across a road where witnesses managed to stop him.

Police said Green then ran over Pitts' crushed body.

“After that, I just completely lost it," said Davis. "I don't understand why. I don't understand why. We were just at the light, just taking me to work like it was any other day. I'll never ever get the image of my mom['s] lifeless body lying on the pavement, and the man ran her over like she was nothing."

Even seasoned investigators said the horrific crash has left them stunned. Police said Green seemed dazed and confused and reeked of alcohol.

“No doubt there's alcohol involved,” said Stan Copeland with Douglas County police.

Davis said her mom, a two-time breast cancer survivor, died on the scene. Police arrested and charged Green with murder and aggravated assault, but he could face more charges. Police said Pitts was expecting another child of her own.

"He could be charged with feticide depending on how far along,” said Copeland.

“She was very happy," said Davis. "She had just got good news about expecting.”

Green is from Alabama. Detectives said his father is in town to try to get answers and help police figure out what happened. Police said Green's father told them his son had been acting strange lately.

When asked about any history of mental illness, said Copeland, “None that we can find, and his family did not mention anything.”

Toxicology testing is being done on Green to find out if he was under the influence of drugs.