DETROIT (AP) — Frank J. Kelley, who died Friday at age 96, was affectionately called the “eternal general” for his 37 years as Michigan’s longest-serving attorney general.

Kelley, a Democrat, served from 1961 to 1999, winning statewide election 10 times. He moved to Naples, Fla., in 2020, said spokesman Chris De Witt, who didn’t give a cause of death.

Kelley was the state government’s top lawyer at a time of sweeping change in politics and culture. He was credited with creating consumer and environmental protection divisions in the attorney general’s office and was a defender of civil rights.

Gov. Gretchen Whitmer ordered state and U.S. flags on public grounds to be flown at half-staff through March 20 to honor the “brilliant and irascible” lawyer.

U.S. Energy Secretary Jennifer Granholm, who became attorney general after Kelley’s retirement, said he had an “Irishman’s gift of humor and a fierce heart for the average working person.”

Indeed, Kelley was aggressive and unapologetic. He said one of his heroes was President Franklin D. Roosevelt, whose New Deal programs in the 1930s expanded the role of the federal government.

“Ronald Reagan used to say, ‘Get the government off your back.’ In a free democracy like ours, the only chance you’ve got is the government,” Kelley said in 2015 at an event to promote an autobiography, “The People’s Lawyer,” he co-wrote with Jack Lessenberry.

“You think a private corporation will take care of you? Forget it,” Kelley said.

The Detroit native was a lawyer in Alpena when Gov. John Swainson appointed him attorney general in 1961. Voters elected Kelley and reelected him for decades; his only loss was a run for the U.S. Senate in 1972.

Kelley’s death occurred nearly 18 months after the death of Michigan’s longest-serving governor, William Milliken, who held the top office for 14 years.