A personal assistant was indicted today for stealing more than $43,000 from her employer, the founder and managing partner of the private equity firm Caxton-Iseman Capitol LLC, Frederick Iseman, the Manhattan district attorney, Robert Morgenthau, announced this morning.

Fatima Monahan, 36, who earned about $125,000 as Mr. Iseman’s assistant, is accused of using his American Express credit card for personal purchases, primarily on the Internet, including high-end clothing, shoes, children’s wear, and food, between June and November 2006, according to the indictment.

Ms. Monahan is also accused of using Mr. Iseman’s private Mercedes-Benz daily without his knowledge or consent, although she was permitted to use the car for work purposes only.

In a statement regarding Ms. Monahan’s arrest, Mr. Iseman said he fired her as soon as he discovered her illegal actions. He added that the civil lawsuit Ms. Monahan filed against him is discredited by today’s indictment. “Her allegations are baseless and dishonest, and were fabricated to distract attention from her own outrageous behavior,” he said.

Ms. Monahan is charged with a felony for grand larceny and misdemeanor for unauthorized use of a vehicle. She faces up to eight years in jail.