Updated at 6:20 p.m. March 11: Revised to include additional details throughout.

Dallas police are searching for a driver they say fatally struck three men and injured two other people early Sunday before abandoning his 12-year-old son at the scene of the crash.

Jesus Chavarria-Vasquez (Dallas Police Department)

Police identified the suspect Monday as 32-year-old Jesus Chavarria-Vasquez. They said he was driving a black 2013 Chevrolet Silverado when he hit and killed three men who had stopped their Toyota Rav4 to change a flat tire along Interstate 635 just west of the Dallas North Tollway around 3:30 a.m. Sunday.

The Dallas County medical examiner's office confirmed that the three killed were Hieu Minh Doan, 22, Christopher Pham, 23, and David Nguyen, 23.

Chavarria-Vasquez's pickup then hit the Toyota, where two people were sitting inside, police said.

At a news conference Monday, police spokesman Sgt. Warren Mitchell said two occupants of the Toyota survived but were injured in the crash. One was hospitalized in critical condition, and the other had non-life-threatening injuries. Police did not release their names or ages.

Chavarria-Vasquez's truck rolled over, and he left the crash on foot, leaving his 12-year-old son behind, police said.

Mitchell said the boy, who suffered head injuries that weren't expected to be life-threatening, was reunited at the hospital with his mother, the suspect's ex-wife.

Mitchell said detectives would "leave no stone unturned" during the course of the investigation and planned to talk with the boy and his mother.

"We do have investigators out pounding the beat trying to look for him," Mitchell said.

Police were able to identify Chavarria-Vasquez as the suspect by talking to his son and ex-wife, and the man left his driver's license at the scene, Mitchell said. Police said they did not know whether the suspect had been drinking before the crash because he was already gone when officers arrived.

Chavarria-Vasquez also owns a black 2008 Cadillac CTS sedan with Texas license plate JZS 0584 and drives a white work van of an unknown make and model, police said.

He faces charges of manslaughter and failure to stop and render aid.

Police said they did not know where Chavarria-Vasquez had been headed before the crash.

Chavarria-Vasquez is a co-founder of a flooring business, which was started last year, according to state records. A call to the phone number listed for the business was not answered Monday.

1 / 4The scene of the wreck in the 3200 block of LBJ Freeway, on the south side of the road, early Sunday.(Robert Flagg / Special Contributor) 2 / 4A damaged truck sits on a tow truck after a wreck in the 3200 block of LBJ Freeway.(Robert Flagg / Special Contributor) 3 / 4A damaged truck sits on a tow truck after a wreck in the 3200 block of LBJ Freeway.(Robert Flagg / Special Contributor) 4 / 4A damaged truck sits on a tow truck after a wreck in the 3200 block of LBJ Freeway.(Robert Flagg / Special Contributor)

Doan's mother, Minh Dang, told told KTVT-TV (Channel 11) that her son graduated last year from the University of Texas at Dallas with a degree in biomedical engineering. He was driving with his four friends after a concert when they got a flat tire.

Doan's sister, Tammy Doan, urged the suspect to turn himself in during an interview with KXAS-TV (NBC 5).

"We're pretty forgiving. We're not going to get mad at you for that," she told the station. "Please turn yourself in. We're not mad."

Tim Bui, a friend of Nguyen's who set up a fundraiser for his funeral expenses and medical expenses for a survivor of the crash, said he met the two through a sports group he started in Plano where friends got together to play volleyball and badminton. He said Nguyen, a recent college graduate, was soft-spoken and "always had a smile on his face."

He said the group of people killed and injured in the crash were a tight-knit group of best friends who loved to spend time together.

Friends and family also set up fundraisers to cover funeral expenses for Doan and Pham.

Mitchell, the police spokesman, expressed his sympathy for the victims, who were "just at the early stages of being able to enjoy life as an adult," he said.

"Dealing with one [victim] is horrific," Mitchell said. "And to compound it three times is unimaginable. It appears that all three were friends, so this just had to be a horrific scene."

He urged anyone with information about Chavarria-Vasquez's whereabouts to call police.

Anyone with information about the crash or the suspect is asked to contact Detective Jearlyn Jackson in the vehicle crimes division at 214-671-0009 and reference case No. 048057-2019.

Staff writer Claire Z. Cardona contributed to this report.