His father, the former chairman and chief executive officer of Beneficial Corp., Finn M.W. Caspersen, died in 2009. Andrew Caspersen’s girlfriend, Catherine Fairfax MacRae, the granddaughter of the founding partner of LeBoeuf, Lamb, Greene & MacRae, was killed in the Sept. 11 terrorist attack on New York, the New York Times reported.

PJT said in a statement today that it was “stunned and outraged” to learn of Caspersen’s fraud. “Our firm’s reputation for ethical behavior is fundamental to our business,” PJT said.

PJT dropped 11 percent to $23.66 in New York, extending its decline to 17 percent since Dec. 31. They fell as much as 25 percent after the charges were announced.

Blackstone was “appalled by the fraudulent actions of this former Park Hill employee,” the private equity firm said in an e-mailed statement. “PJT and the authorities will have our full cooperation and assistance as they pursue this matter.”

(Earlier versions of this story were corrected to reflect the nature of the firm and to indicate that charges were included in a criminal complaint.)

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