The reported incident occurred on July 4, and a witness told The Washington Post that he saw a woman push the man, Rodolfo Rodriguez, to the ground and hit him.
Investigators initially believed Rodriguez may have bumped into a young girl who was with Jones, prompting her to assault him. That's when about three of them also began beating him, she added.
"I didn't even bump into her kid", Rodriguez said.
The girl's mother, who police later identified as Jones, shoved him to the ground and beat him with a concrete brick, officers said.
"I heard her saying, 'Go back to your country; go back to Mexico, ' " she told CNN by phone.
Borjas, 35, said Rodriguez was hit about five times with the brick and that Jones yelled at him: "Go back to your country". The man, Rodolfo Rodriguez, said he was out for a walk when he was struck in the head by a concrete block.
The witness, Misbel Borjas, recorded graphic video after the assault and also captured an image of a woman - whom the Sheriff's Department confirmed investigators were looking for. The witness said the attacker told Rodriguez, who is a legal USA resident, to "go back to your country", KCBS-TV previously reported.
Rodriguez, whose face is still black and blue a week after the attack, hugged Borjas outside his home Wednesday and thanked her for her help.
He told reporters that he doesn't know why he was attacked and is grateful for the outpouring of community support and well wishes he's received.
"I'm just overwhelmed how anybody can do this to a human being at all", Mr Mendoza told CBS News.
Jones was arrested on suspicion of assault with a deadly weapon. "I've never asked for bad things to happen". They'll give her the punishment she deserves'.
One photo released by his family showed the elderly man with blood dripping down his face.
"Who would do this to anybody?" the victim's grandson, Erik Mendoza, told NBC Los Angeles.
A 92-year-old grandfather was beaten with a brick while on a walk. There's no harm that he meant'.
The witness said a group of about four men joined in the attack and the assailants fled as law enforcement was being called.
According to reports, the 92-year-old Rodriguez was taking his daily walk around the block near his Willowbrook home when he was confronted by a woman with a child.