NEW YORK (AP) — A 70-year-old hedge fund founder has been found shot dead inside his Manhattan apartment.

Thomas Gilbert was shot in the head at his Beekman Place residence on the East Side on Sunday, police said. He was pronounced dead at the scene.

Police were questioning his 30-year-old son, Thomas Gilbert, Jr., on Monday. No charges have been filed.

It was not immediately known if he had a lawyer.

Police said a handgun was found near the body.

The elder Gilbert founded Wainscott Capital Partners Fund in 2011. The fund, which focuses on biotech and health care industries, has $200 million in assets.

Industry publication Hedge Fund Alert said in an August 2013 article that the fund had a net return of nearly 25 percent in 2012.

Gilbert previously co-founded Syzygy Therapeutics, a biotech asset acquisition fund. He also was founder and CEO of an online teacher-education company called Knowledge Delivery Systems Inc.

He was a graduate of Princeton University and Harvard Business School.

The shooting was a rare act of violence on Beekman Place, a tony enclave just north of the United Nations in the Sutton Place neighborhood.