The shooting was reported at about 2 a.m. Tuesday.
Police Capt. William McMenamin told The Press of Atlantic City the 49-year-old's body was inside a car at the Caesars Atlantic City parking garage.
McMenamin says the man, whose name has not been released, had been missing for several days.
Information from: The Press of Atlantic City, http://www.pressofatlanticcity.com