Nancy Wilson Cook, a pioneering figure in Delaware politics and the longest-serving woman in the Delaware General Assembly, passed away on March 23, 2026, at the age of 89. Born in Philadelphia, Pennsylvania, Cook grew up in New Castle County, Delaware, and attended the University of Delaware. Her remarkable career in public service spanned decades, leaving an indelible mark on the First State's legislative and fiscal landscape.

Cook's journey into politics began in 1974 when she was elected to the Delaware State Senate, representing the 15th District, a seat previously held by her late husband, Allen J. Cook. She made history as the first elected female Democratic Delaware state senator, breaking barriers and paving the way for future generations of women in leadership. Her dedication to her constituents in Kent County was unwavering, earning her a reputation as a fierce champion for their needs.

Throughout her 36 years in the Senate, Cook held numerous influential positions. Within a year of her initial election, she was appointed Senate Majority Whip. She also chaired the Senate Highways and Transportation Committee and the Joint Capital Bond Bill Committee. However, she was perhaps best known for her groundbreaking tenure as the first woman to chair the Joint Finance Committee, a role she held or co-chaired for an impressive 25 years, guiding the state's budget through various economic climates.

Senator Cook's legislative accomplishments were vast and impactful. She was instrumental in championing the Agland Preservation Program, establishing Delaware's "rainy day fund," and supporting the state's AAA credit rating. Her efforts also played a key role in the purchase of the Port of Wilmington, demonstrating her commitment to the state's economic prosperity. She was recognized for her significant contributions to public policy, including being inducted into the Delaware Women's Hall of Fame in 1998 and receiving the esteemed Dick DiSabatino Award.

Even after concluding her Senate service in 2010, Cook continued to serve the public. From 2011 to 2012, she was appointed as the Kent County Register of Wills by Governor Jack Markell. She remained active in her community, serving on boards such as the Polytech School District and the DE Turf board of directors, consistently working to improve the quality of life for all Delawareans.

Nancy Wilson Cook will be remembered not only for her legislative prowess and her pioneering spirit but also for her integrity, her commitment to bipartisanship, and her willingness to mentor both Democrats and Republicans. Her legacy of dedicated public service and her profound impact on Delaware will endure for many years to come.