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PURCELL, Okla. - A teenage boy has been declared brain dead after he was hit by a vehicle Monday night, his family tells NewsChannel 4.

Rafael Garcia-Andrade, 13, was walking back from buying fireworks around 9 p.m. Monday night when he was struck by a pickup truck that hopped the curb, said his sister.

"From what we're told, he was walking and he turned back maybe and saw the car was jumping the curb to hit him, so he pushed his friend out of the way and obviously he got hit," said Kasey Winn, Garcia-Andrade's sister. "He was walking on the sidewalk, doing what he should have been doing and somebody popped up on the curb."

This is Rafael Garcia-Andrade, the boy who was hit while walking. Family tells me he was on he sidewalk. @kfor pic.twitter.com/cnUUwURliJ — Lorne Fultonberg (@LorneFultonberg) July 4, 2017

The driver then sped off. Police are still searching for the person responsible.

"Why didn't they stop to see what happened?" Winn asked. "I don't know if they were intoxicated or not, but you know you hit something when you hit it. I want to find who did it. Even if it was an accident, please just come forward and say 'I did it.'"

Garcia-Andrade's family said his father, who was coming to pick him up, found him unresponsive on the pavement.

UPDATE: His family tells me 13y/o Rafael Garcia-Andrade has been declared brain dead. He is the victim of the Purcell hit and run. @kfor pic.twitter.com/F3j3MuzCs3 — Lorne Fultonberg (@LorneFultonberg) July 4, 2017

His family described the teenager as shy and quiet but loving. He enjoyed longboarding and cars, his sister said.

"He's just the sweetest boy ever," she said.

A GoFundMe account has been set up to help the family with medical expenses.

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