Update 9:40 a.m. Sunday: Carroll has been located unharmed by the Hempstead Police Department.
Police have issued a Silver Alert for a Smithtown man who suffers from dementia.
Dennis Carroll, 71, of Bradley Court, was last seen at his home Saturday at around 4:30 a.m. Carroll is driving a red four-door 2013 Honda Civic with a New York license plate number SF18Z, police said.
Carroll is described as white, 5-foot-9, approximately 152 pounds, with hazel eyes and gray hair. He sometimes wears glasses.
Anyone with information on his location is asked to call Fourth Squad detectives at 631-854-8452 or call 911.