Stefanie A. Murphy is a partner at Marin & Murphy Law Firm and the firm's lead federal criminal defense attorney in Connecticut, admitted to the United States District Court for the District of Connecticut and representing clients at all three D. Conn. courthouse locations in New Haven, Hartford, and Bridgeport.

Attorney Murphy has tried serious felony cases to verdict in jury trials, including homicide-level charges. The Providence Journal reported her jury acquittal in a murder prosecution — a case where co-defendants are serving life sentences for the same incident. She has served as lead counsel in a post-conviction DNA exoneration case challenging a decades-old conviction, with multiple news articles covering her advocacy. Her practice encompasses multi-day Superior Court felony jury trials, high-visibility criminal matters, and constitutional evidentiary challenges across New England.

Attorney Murphy holds active federal bar admissions across all three Southern New England federal districts — D. Conn., D. Mass., and D.R.I. — enabling seamless representation across the regional federal system. She is admitted to the state bars of Connecticut, Rhode Island, and Massachusetts, and is a member of the National Association of Criminal Defense Lawyers. She has been selected to Super Lawyers for 14 consecutive years (Rising Star 2012–2018, Super Lawyers 2019–2025), among the longest active runs of recognition in Southern New England criminal defense.

Attorney Murphy's practice focuses specifically on the intersection of scientific evidence and criminal defense. She serves as lead editor of A Practical Guide to Trying DUI Cases in Rhode Island (MCLE New England, 2nd Edition 2024), and has published and lectured on the reliability challenges embedded in forensic evidence, including search and seizure doctrine and pretrial motions practice. That analytical rigor applies directly to the wiretap evidence, forensic lab reports, cell-site data, and quantity calculations that drive federal criminal sentencing. The Rhode Island Municipal Police Training Academy has invited her to lecture on trial practice and defense strategy, giving her direct insight into how law enforcement officers are trained to conduct the investigations that feed federal prosecutions. She has also prosecuted criminal matters as a Town Solicitor for Rhode Island municipalities, bringing prosecution-side perspective to cooperation agreement negotiations, safety valve eligibility analysis, and plea strategy.

Marin & Murphy represents clients facing the full range of federal criminal exposure in the District of Connecticut, with particular focus on cases involving Connecticut federal white collar defense, federal PPP and ERTC fraud, federal Medicare fraud, federal detention hearings and pretrial release, and pre-indictment representation for business owners under federal investigation by the U.S. Attorney's Office for the District of Connecticut.