VIENNA, Virginia (CNN) -- The acting chief financial officer of mortgage finance giant Freddie Mac was found dead Wednesday morning at his home, police said.



David Kellermann, acting CFO of Freddie Mac, was found dead on Wednesday, police said.



David Kellermann was found dead of an apparent hanging, a source familiar with the investigation told CNN.



There were no signs of foul play when officers arrived at the home in Vienna shortly before 5 a.m., said Lucy Caldwell, a spokeswoman for police in Fairfax County, Virginia. She said the death "may have been an apparent suicide."



A second Fairfax County police spokesman, Eddie Azcarate, said Kellermann's body was found in the basement.



"The exact cause of death ... we're going to wait for the medical examiner," he said. Police were called by someone inside the home, he said, but he didn't know who made the report.  Watch why police don't suspect foul play »



Family members remained in the home, and several visitors went inside.



Freddie Mac has been immersed in financial problems since last year, when the government took it over in the midst of the escalating subprime-mortgage loan crisis. Federal prosecutors in New York and Virginia have been investigating it, as has the Securities and Exchange Commission, according to a March 11 company filing.



Sharon McHale, Freddie Mac's vice president for public relations, issued a statement at midday, saying, "Freddie Mac knows of no connection between David Kellermann's death and the regulatory inquiries that were discussed in our recent SEC filing."



Neighbors indicated there was no sign that Kellermann had problems.



"They were very friendly with all the young families in the neighborhood ... terrific people," said neighbor Paul Unger. "We saw him when he was out working in the yard. ... We didn't spend a lot of time together."



"We're beyond shocked," he said. "He was a great family guy with a beautiful young child."



They had the most decorated home at Christmas, Unger added. "I cannot imagine what has happened. ... This is a nightmare."



"I asked the policeman what was going on and he told me. I was stunned, silent, shed tears. I feel terrible," Unger said.



"This is a solid, salt-of-earth kind of family ... and I just cannot imagine what would have driven him to it."



Another neighbor said the family was very "community-oriented," and liked hosting parties at their house.



"We're very, very upset right now," said the woman, whose daughter baby-sat for the Kellermanns' 5-year-old daughter. "This is just too much for us."



"They were a very happy, happy couple. So it was a shock when we came upon it."



Kellermann, 41, was a man "of great talents," Freddie Mac's interim CEO, John Koskinen, said in a written statement.



"He dedicated those talents to Freddie Mac for more than 16 years, serving in many business and finance capacities before recently taking the reins as acting chief financial officer.



"His extraordinary work ethic and integrity inspired all who worked with him. But he will be most remembered for his affability, his personal warmth, his sense of humor and his quick wit."



Treasury Secretary Tim Geithner offered his condolences in a written statement: "On behalf of the Treasury family, we are deeply saddened by the news this morning of David Kellermann's death. Our deepest sympathies are with his family and his colleagues at Freddie Mac during this difficult time."



Freddie Mac was established by Congress in 1970 to provide liquidity, stability and affordability to the nation's residential mortgage markets. It supports communities across the nation by providing mortgage capital to lenders.



Kellermann, who served as a senior vice president in addition to acting CFO, was named to those posts in September. He was responsible for the company's financial
What was the cause of death? Who is Kellermann?
"may have been an apparent suicide." acting CFO of Freddie Mac,
question: What was the cause of death?, answer: "may have been an apparent suicide." | question: Who is Kellermann?, answer: acting CFO of Freddie Mac,