NEW YORK — The 40-year-old son of former ABC News anchor Ted Koppel was found dead in an apartment in upper Manhattan after a day of bar hopping with a man he met at a watering hole, a law enforcement official said Tuesday. Andrew Koppel was declared dead around 1:30 a.m. Monday in the apartment in the Washington Heights neighborhood, Detective John Sweeney said. The cause of death has not been determined.