A Silver Alert has been issued for Robert Arnold, 64, of Westbury, who was last seen Sunday.
Nassau authorities said the man may be headed to Wyandanch or Huntington.
He is described as black, 5-foot-6, weighing 160 pounds. He was last seen in 1999 green Nissan with New York State plates GED4560.
He may be suffering from onset dementia.
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