NEW YORK (AP) – The 40-year-old son of former ABC News anchor Ted Koppel was found dead in an apartment in upper Manhattan, and the cause of death is being investigated, authorities said yesterday.

Andrew Koppel was declared dead around 1.30 a.m. on Monday in the apartment in the Washington Heights neighborhood, Detective John Sweeney said.

Ellen Borakove, a spokeswoman for the city medical examiner, said an autopsy was performed on Monday but results were pending further study, including toxicology and tissue testing.

Additional tests were needed to determine the manner and cause of death, Borakove said. They will take a few weeks to complete, she said. Koppel had been drinking for hours with a man he met at a bar, the New York Post reported yesterday.

"He had a straw hat on, and I had one on, and he said, 'Nice hat, man'," his drinking partner, Russell Wimberly, told the newspaper.

"We got to talking, and he started buying me drinks."

Wimberly said that Koppel drank whiskey, and that neither man had anything to eat all day.

Koppel was appointed attorney for the city Housing Authority's civil litigation division in 2001, a post he resigned in 2008, the agency said yesterday.

Ted Koppel was the longtime anchor of the ABC News show 'Nightline'. Andrew Koppel, of Queens, was one of his four children.