The estate of Linda Garner Riggs, a former Arkansas insurance commissioner who later worked for Stephens Inc. for 25 years, has made a gift of $1 million to the University of Arkansas for Medical Sciences.

Riggs died in November. Her estate’s gift will go to research into triple negative breast cancer, an aggressive former of cancer that does not respond to the most common hormonal therapies. It accounts for 20 percent of cases and is more likely to occur in young people, African Americans, Hispanics and persons with the BCRA1 gene mutation.

Riggs was a native of Fordyce. At one point in her 10-year career in state government, she was the legislative and budgetary director for Gov. Frank White.