David S. Doty, Judge Who Helped Shape the Modern N.F.L., Dies at 96

David S. Doty, a federal judge who presided over a series of cases involving National Football League players that led to a landmark agreement in 1993 that ushered in free agency, a salary cap and revenue sharing, which shaped the modern N.F.L., died on June 27 in Edina, Minn. He was 96.

His death, in hospice care, was confirmed by his daughter, Laura Mary Doty. He had been living in Minneapolis, where he served on the U.S. District Court for the District of Minnesota, and was still carrying a substantial caseload until February, when he fell while exercising.

For nearly two decades after the 1993 agreement, Judge Doty, a straight-talking, meticulous former Marine, oversaw the class-action settlement named after Reggie White, the star defensive end who had been the lead plaintiff for a group of players trying to win free agency.

During those years, the league sometimes chafed at Judge Doty’s supervision, preferring that disputes be resolved at the bargaining table. But he was considered fair-minded, even though he often ruled in the players’ favor and at times showed little patience for some of the owners’ positions. One former N.F.L. lawyer, Frank Hawkins, said in an interview that the players’ lawyer, Jeffrey Kessler, had a “home court advantage” in Judge Doty’s court.

Still, the judge’s role in resolving disagreements provided much-needed stability that ultimately helped both owners and players make a lot more money.

“Doty set up a system of certainty which allowed the N.F.L. to grow exponentially,” Bob Boland, a former N.F.L. player agent who now teaches sports law at Seton Hall University School of Law, said in an interview. “It’s an enormous success story.”

The N.F.L.’s annual revenue has grown to about $23 billion from $2.2 billion in 1993, while team payrolls have jumped to more than $300 million from around $35 million in 1994.

Judge Doty’s long stewardship of the league’s labor relations prompted James Rosenbaum, a retired District Court judge from Minnesota, to tell Minnesota Public Radio in 2011 that he deserved to be in the Pro Football Hall of Fame.

“He has been a major influence on a major sport for longer than any player who has ever played in the league,” Judge Rosenbaum said. “If there’s any conscience in this system, eventually they’re going to put him in the Hall.”

Judge Doty entered the fray between the league’s owners and players at a critical juncture. The players had gone on strike twice — in 1982 and 1987 — to try to win full free agency, something Major League Baseball players had won in the 1970s and N.B.A. players achieved in 1988.

A group of hard-line owners insisted that free agency would wreck the league, and even resorted to hiring scab players during the strike in 1987. The legal battles and the possibility of work stoppages made television networks skittish about paying heavily for broadcast rights, the league’s largest source of revenue.

Paul Tagliabue, the league’s former outside counsel who became its commissioner in 1989, knew the N.F.L. would not thrive until the two sides were partners. He took an active role in labor negotiations, wresting some power from the owners.

In 1990, lawyers for the players filed an antitrust suit against the N.F.L. with the running back Freeman McNeil as the lead plaintiff. The players sought to file the case in New Jersey, but the N.F.L. had it moved to Minneapolis because Judge Doty had heard an earlier case related to free agency involving the offensive tackle Marvin Powell. (The judge ruled against the N.F.L. in that case, but his decision was overturned on appeal.)

After a jury sided with McNeil, the players filed another case on behalf of hundreds of other players, this time with White as the lead plaintiff. By late 1992, some owners were refusing to budge on one thorny issue that was keeping the two sides from reaching a deal.

Judge Doty called the players’ lawyers into his chambers and showed them an envelope that he said contained his decision in the case, adding that he would issue it the next day if the two sides did not reach a settlement.

He didn’t say what the ruling was, the players’ lawyer Mr. Kessler recalled in an interview, “but he clearly told the N.F.L. owners that they wouldn’t be happy with the decision.”

Suspecting that the deal that was on the table might well offer a better outcome for the owners than Judge Doty’s ruling, the Giants owner Wellington Mara sided with Tagliabue and the Steelers owner Dan Rooney, and told the judge that they would take the proposed deal to the full ownership for a vote. Several days later, in early January 1993, the owners agreed to greatly expanded free agency for the players in return for a hard salary cap for teams. The league’s revenue would be split evenly between the sides over time.

Judge Doty oversaw the settlement and adjudicated disputes until 2011. His power over the N.F.L. prompted The Washington Post to write an article that year that asked in its headline, “Is David S. Doty the most influential man in pro football?”

David Singleton Doty was born on June 30, 1929, in Anoka, Minn., a suburb of Minneapolis. His father, Walter, was an engineer, and his mother, Miriam (Singleton) Doty, managed the home and was a part-time artist.

David played guard and tackle on his high school football team, then tried out for the team at the University of Minnesota as a fullback and a linebacker. The physical rigors sent him home to his parents’ one day, achy and in need of a bath. While in the tub, he fell asleep while reading from a red trigonometry book.

“My mother comes in and she thinks I’ve died,” he told The New York Times in 1992. “I’m lying in there and the water is red, as if it’s full of blood. She told me then: ‘You’ve got to make a decision. Either you’re going to be a football star or you’re going to concentrate solely on your education.’ It wasn’t too hard a decision.”

He graduated in 1952, then entered the Marine Corps, where he served until 1958 and rose to the rank of captain. After earning his law degree at the University of Minnesota in 1961, he spent 26 years in private practice in St. Paul and Minneapolis, where he specialized in labor law. In 1987, he was nominated to the federal bench by President Ronald Reagan.

“I took a 400 percent pay cut from my Minneapolis law firm to take this job,” he told The Times. “I thought it was the perfect place to serve, and I got the idea very early, even as a child, that the best way to live life is to try and help other people.”

Overseeing the N.F.L. settlement was Judge Doty’s best-known legal legacy. But he presided over a wide variety of cases; in January, he handled about a dozen cases involving people arrested during the Trump administration’s immigration enforcement campaign in Minneapolis, known as Operation Metro Surge.

Judge Doty’s wife, Mary Frances (Wagner) Doty, died in 2015. In addition to his daughter, he is survived by his partner, Anita S. Duckor; two sons, John and Robert; four grandchildren; and two great-grandchildren.

Given football’s popularity, Judge Doty’s decisions were widely scrutinized. In 2008, he ruled that the quarterback Michael Vick, who had gone to jail for running a dogfighting ring, could keep most of his $20 million bonus, prompting The Daily News to write in a headline: “Judge throws Vick a bone.”

Greg Simpson, an employment lawyer in Minneapolis who argued cases in front of Judge Doty, called him decisive and undaunted by criticism.

“He didn’t care whose ox got gored and wasn’t afraid of being reversed on appeal,” Mr. Simpson said in an interview. “He had a lot of common sense.”