January 5, 2015 9:17 AM EST

A Wall Street financier who founded a $200-million hedge fund was found dead Sunday in his upscale New York City apartment after a fatal shooting, police said.

Seventy-year-old Thomas Gilbert Sr., the founder and chief investment officer of Wainscott Capital Partners, was shot at his multimillion-dollar apartment on the East Side of Manhattan, allegedly during an argument with his son. He was killed by a single shot to the head, police said. His 30-year-old son, Thomas Gilbert Jr., was taken into custody for questioning, the New York Daily News reports. The younger Gilbert has yet to comment publicly.

Wainscott Capital Partners has about $200 million in assets and focuses on the biotech and health care industries. Gilbert previously co-founded Syzygy Therapeutics, a private equity fund focused on the biotech industry.

Gilbert’s is the first homicide in the tony Sutton Place neighborhood on Manhattan’s Upper East Side since January 2006.

[New York Daily News]

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