A mentally handicapped man who went missing five days ago still has not been found - and the Nassau police on Friday issued a "wanted poster" alerting the public to his plight.

Keith Siegel, 47, who lives in a group home in Russell Gardens, was last seen in his neighborhood at around 9 a.m. riding his bicycle.

Then Wednesday he was sighted bicycling near Belmont Park in Elmont sometime between 2 and 3 p.m. The racetrack is about six miles south of Russell Gardens. Later Wednesday he was seen at a couple of McDonald's fast-food restaurants on Hempstead Turnpike in East Meadow.

Missing Persons detectives said Siegel has diminished mental capacity and requires medication. He was described as white, 5-foot-7 inches tall, between 185 and 200 pounds, with brown eyes and short, wavy gray hair. He was wearing a bicycle helmet.

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He is known to frequent fast-food restaurants and diners.

A poster issued by Nassau police seeks the public's help in finding Keith Siegel of Russell Gardens, who has been missing for five days. Photo Credit: Handout Photos

Anyone who may be able to help locate him is asked to call the Missing Persons Section at 516-573-7347. All information will remain confidential.