(CNN) Tears glistened on the black and purple bruises covering 91-year-old Rodolfo Rodriguez's face as he described being attacked by a group of people while going for a walk on the Fourth of July.

"I can't walk anymore," Rodriguez said in Spanish. "I'm in so much pain."

He'll be turning 92 in September, Rodriguez said, and he's never been hurt like this before, in a life working the fields with cattle and corn.

He had traveled from Michoacan, Mexico, to visit his family in Willowbrook, California, a city in Los Angeles County, his grandson Erik Mendoza said.

He makes the trip about twice a year, and takes a walk through the neighborhood every day after lunch, Mendoza said. "Everyone in the neighborhood knows him already," he said.

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