Pro Football Hall of Famer and Super Bowl champion Steve McMichael, who died last year at 67 after a five-year fight with ALS, has been posthumously diagnosed with chronic traumatic encephalopathy, better known as CTE.

The Concussion & CTE Foundation announced that McMichael was diagnosed with stage 3 CTE. CTE can only be diagnosed after death.

McMichael revealed he had ALS in 2021, and pledged his brain to be studied upon his death, according to Chris Nowinski, co-founder and CEO of the Concussion & CTE Foundation.

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Steve McMichael of the Chicago Bears runs a play during a game against the Dallas Cowboys in Chicago, Illinois, on Dec. 29, 1991. The Cowboys beat the Bears 17-13. (Jonathan Daniel/Getty Images)

“Too many NFL players are developing ALS during life and diagnosed with CTE after death,” his wife, Misty McMichael, said in a statement released by the foundation. “I donated Steve’s brain to inspire new research into the link between them.”

CTE is a degenerative brain disease that has been found in athletes in contact sports, combat veterans, and others exposed to repetitive head trauma. It has been known to cause violent mood swings, impulsive behavior, and depression.

ALS affects nerve cells in the brain and spinal cord, causing loss of muscle control.

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Misty McMichael, wife of 2024 Pro Football Hall of Fame inductee Steve McMichael, poses with his bust during the enshrinement ceremony at Tom Benson Hall of Fame Stadium in Canton, Ohio, on Aug. 3, 2024. Steve McMichael was unable to attend due to illness. (Charles LeClaire/USA TODAY Sports)

According to a 2021 study by the Harvard Medical School and the Boston University CTE Center, NFL players are more than four times more likely to develop ALS than other men. Dr. Ann McKee, director of the Boston University CTE Center, said about 6% of individuals with CTE in the brain bank also have ALS, also known as Lou Gehrig’s disease.

“There is strong evidence linking repetitive brain trauma and ALS,” McKee said.

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Steve McMichael smiles during the Chicago Bears training camp in Lake Forest, Illinois, on Aug. 28, 1990. (Charles Cherney/Chicago Tribune/Tribune News Service)

McMichael, who was inducted into the Pro Football Hall of Fame in 2024, was a key member of the Chicago Bears’ Super Bowl winning season in 1985. McMichael spent 13 seasons of his career with the Bears, racking up 847 combined tackles and 91 sacks in 191 games with Chicago.

McMichael played in the NFL for 15 seasons, spending his rookie season with the New England Patriots, his next 13 with the Bears, and his final one with the Green Bay Packers.

The Associated Press contributed to this report.

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Caleb Williams has no time for haters.

The Chicago Bears quarterback addressed his viral painted nails on an episode of “The Rush with Maxx Crosby” recently, sharing that he “couldn’t care less” what the critics have to say.

“You know, people feel a certain way about it in a masculine sport and I give no f—ks, to be honest with you. I couldn’t care less,” the athlete said on the podcast.

“And I’m gonna keep doing it and it’s unique to me and it’s a cool way to embrace certain things, show love to certain things … so that’s why I do it.”

Williams shared that his mother is a nail technician, and his interest in manicures “stemmed from” watching her work.

But it wasn’t until a date with a former flame that he considered painting his own nails.

“One day I was with one of my exes and we were going to the nail salon and she was like, ‘Why don’t you get [yours done too]?’” he recalled.

“I was like, ‘F—k it.’ I know who I am, I know what I like. And so, I did it. And it ended up becoming, you know, three nails, four nails, five, six … and I ended up just doing it.”

At first, Williams used his decorated digits to rile up opposing teams, writing messages like “F—k Texas” on his nails.

“I enjoy trolling, I do. I have to be careful with it now … but I do it sometimes,” he said. “And I try and do it smart.”

It quickly became a way to raise awareness for causes he cared about, though.

“I’ve done the suicide prevention number, I’ve done breast cancer awareness,” he said. “It’s like wearing pink cleats and a pink headband. It’s just gel on my nails!”