As of 10 p.m. Arizona time, Brnovich had 53.4 percent of the vote out of nearly 1.3 million votes cast, while Contreras had 46.6 percent.
Brnovich, a Republican, was first elected to the position in 2014. He is an Arizona State alum and was a member of the Army National Guard before serving as Assistant U.S. Attorney for the District of Arizona and Arizona's assistant attorney general. He was also the director of the Arizona Department of Gaming.
Contreras is a University of Arizona alum who went on to become a deputy Maricopa County attorney, an assistant state attorney general, and an ombudsman and director with the U.S. Department of Homeland Security. She served as CEO for nonprofit group Arizona Legal Women and Youth Services.