Police are looking for the son of 70-year-old Thomas Gilbert Sr., founder of the $200 million-worth Wainscott Capital Partners, as a person of interest in the shooting death of his father on Sunday.

The New York City Police Department said Thomas Gilbert Jr., 30, is "actively being sought" for the killing of the older Gilbert who was found with a bullet in his end at his eighth-floor apartment in Upper East Side Manhattan. They did not say if Gilbert Jr. was a suspect.

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A police spokesperson said, the young Gilbert was the only other person in the upscale apartment and had fled on foot after the incident. It was the victim's wife that called emergency services.

Gilbert Sr. was a Princeton and Harvard Business School graduate who founded Wainscott Capital Partners in 2011. According to its website, the New York-based company "is an opportunistic, actively-managed global long/short equity hedge fund that focuses primarily on biotech/healthcare investing."

It added that, he has "spent 40 years on Wall Street with direct investing experience in the stock market, as well as private equity, real estate, and the fixed income market."

Before Wainscott, Gilbert co-founded Syzygy Therapeutics, a private equity asset acquisition fund focusing on identifying and investing on biotech drug candidates.

He had worked at Loeb Partners Corporation where he was responsible "for originating, structuring, and monitoring a broad spectrum of private equity portfolio investments." He had also founded and ran Knowledge Delivery Systems, an online educational provider, according to the Wainscott website.

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