Fairfield resident Deirdre M. Daly was sworn in Wednesday as the U.S. attorney for Connecticut, the first woman to hold the post.

Daly, 54, the daughter of the late Michael J. Daly, a well-known Fairfielder awarded the Medal of Honor for his service in World War II, became the state's 51st U.S. attorney after taking the oath from Janet C. Hall, the chief federal judge in Connecticut, in New Haven. Her late uncle, T.F. Gilroy Daly, another Fairfielder, had been a federal judge.

President Barack Obama nominated Daly to serve as U.S. attorney in March and the U.S. Senate confirmed her nomination last week.

"I am grateful to those who supported my nomination and deeply appreciate the opportunity to serve in this position," Daly said in a press release issued by her office. "I very much look forward to continuing to work with the dedicated and talented people in our office as well as our many law-enforcement partners throughout the state."

She had served as the U.S. attorney in an acting or interim capacity since last May, following the resignation of her predecessor, David Fein. From July 2010 until then, she was the first assistant U.S. attorney, assisting in oversight of the Criminal and Civil Divisions.

From 1985 to 1997, Daly was an assistant U.S. attorney in the Southern District of New York, where she prosecuted a range of cases, from racketeering and murder to corruption and fraud, according to her office. She later served as the assistant-in-charge of White Plains office for three years.

After leaving the federal Department of Justice, Daly was a partner at Daly & Pavlis LLC, a Connecticut law firm with a practice focused on corporate and commercial litigation, white-collar criminal investigations, SEC enforcement and corporate internal investigations and monitoring.

A graduate of Dartmouth College and Georgetown University Law Center, Daly early in her career was a law clerk for federal Judge Lloyd F. MacMahon in the Southern District of New York.

As U.S. attorney, Daly supervises a staff of approximately 64 assistant U.S. attorneys and 60 staff members at offices in Bridgeport, New Haven and Hartford.