Thomas Gilbert, 70, founder of the multimillion-dollar hedge fund Wainscott Capital Partners, was found dead at his Manhattan apartment on Sunday. The New York Police Department, which is investigating the death, is questioning his son, Thomas Gilbert Jr., who is reportedly in police custody.

Gilbert died after he was shot in the head and his body was found by his wife at about 3:30 p.m., local time, in the couple's bedroom. His wife was not at their apartment in Beekman Place when the shooting took place, police said, according to NBC New York. A gun was reportedly found near the body, and police have not ruled out a case of suicide. Officials also said that Gilbert’s son was the only other person inside the apartment during the shooting. However, no charges have been filed so far in the case.

"It’s upsetting just because this neighborhood is so safe," Karen Bergreen, a neighbor, said, according to CBS New York adding: "…I feel bad for the victim and I hope this doesn’t mean an upping of crime in the neighborhood."

A police official did not disclose if the son was a suspect in the case, but said both son and father were discussing differences in their relationship before the shooting, Bloomberg reported.

Gilbert, a graduate of Princeton University and Harvard Business School, started his hedge fund in 2011. The company focused primarily on biotechnology and health care investments. Gilbert had previously co-founded Syzygy Therapeutics, a biotech private equity firm, before starting Wainscott, according to the company’s website. Gilbert had also founded Knowledge Delivery Systems, an online education provider, and was its chairman and CEO between 2000 and 2009. He was also a former managing director of venture capital at Loeb Partners Corporation.