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A grandmother and three-time cancer survivor was robbed and beaten in a Fontana, California parking lot.

Marybel Centeno, 53, was leaving a MetroPCS store and walking back to her car when a man grabbed her by the back of the neck and pointed a gun at her.

Police are searching for three people, described as being in their 20s or 30s, and involved in an armed robbery and assault on Centeno.

Centeno suffered “serious brain injuries,” police said.

Her family says she now requires 24-hour care.

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The aggressor tore Centeno’s gold chain necklace off her neck. The two struggled, causing the man to drop the gun, the police statement said.

Centeno attempted to run from her attacker, but he gave chase and pistol-whipped her and fractured her skull, according to authorities.

Surveillance video shows the assailant entering a black Mercedes-Benz E-Class sedan, with tinted windows, driven by an unknown female driver and a man in the passenger seat.

"I'm just hoping that somebody will come forward and help me find these guys," Centeno later said in an interview with KTLA5.

"I'm a three-time cancer survivor," Centeno said. "I'm determined to find this young man. I've always been a fighter and I'm not ready to give up."

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