Katelyn Donnelly Accident Attorney. Born and raised in Chalmette, Katelyn joined the Cossé Law Firm as an associate attorney in 2018 after passing the Louisiana State Bar Exam. Katelyn represents clients in almost all types of personal injury claims. Her practice primarily focuses on seeking compensation and justice for the victims of car collisions, workplace injuries, and actions arising out of premises liability. Katelyn is a member of the Louisiana State Bar Association, the American Association for Justice, the Academy of New Orleans Trial Lawyers, and the Louisiana Association for Justice. She is admitted to practice in all state courts in Louisiana as well as the United States District Court for the Eastern District of Louisiana. Call today for a free consultation.