The Arizona Republic said Maricopa County health authorities planned to release details of the fatality at a news conference. At least 14 Arizona residents have been diagnosed with West Nile since the virus first appeared in the county last summer.
West Nile had been seen in Southern California's San Bernardino County, but not in the neighboring L.A. area until Friday when it was confirmed in an unidentified man in the eastern half of the county.
West Nile is spread by mosquitoes that bite infected birds.
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