The pressures were already immense when David B. Kellermann was promoted to the top financial position at the mortgage giant Freddie Mac last September. Mr. Kellermann's boss and other top executives were ousted when the Treasury secretary seized Freddie Mac and its sibling company, Fannie Mae; others left on their own and were not replaced. Early on Wednesday, Mr. Kellermann went to the basement of his brick home and hanged himself, according to people familiar with the situation who were not authorized to speak. His body was removed five hours later, through a throng of neighbors, television crews and others. David was such an honest and humble person," said Tim Bitsberger, Freddie Mac"s treasurer until he left in December. "It just doesn't make sense," Mr. Bitsberger said. The roots and causes of suicide are often unclear. It is not known if Mr. Kellermann succumbed to the pressures of his job. But in the aftermath of his death, it is plain that at Freddie Mac, as at many of the companies in the center of this economic storm, there are forces so strong they can overwhelm almost anyone. Mr. Kellermann ... was at the intersection of some of the most difficult issues facing the company. Mr. Kellermann was also working in a poisonous political atmosphere. He was recently involved in tense conversations with the company's federal regulator over its routine financial disclosures. Freddie Mac executives wanted to emphasize to investors that they believed the company was being run to benefit the government, rather than shareholders.