Antonio Brown said in an Instagram Live appearance that former teammate James Harrison gave him CTE.

Harrison was apparently shocked to learn of the former Pittsburgh Steelers receiver's claim.

James Harrison running out of tunnel

James Harrison of the Pittsburgh Steelers walks onto the field before the start of a game against the Oakland Raiders at Heinz Field Nov. 8, 2015, in Pittsburgh.   (Justin K. Aller/Getty Images)

Harrison tweeted the infamous video of Idris Elba choking on a chicken wing in an episode of "Hot Ones," saying he had received 150 text messages Saturday morning.

"Me realizing why I had 150 text messages this morning," Harrison wrote. 

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Brown said Harrison gave him CTE and caused his "aggressive behavior."

"I wanted to tell you guys that I think James Harrison gave me CTE. James Harrison had an illegal helmet for over 20 years in the NFL, and he hit me one time. And, ever since he hit me, I’ve been super aggressive. So blame James Harrison for my CTE," Brown said.

Chronic traumatic encephalopathy (CTE) is a brain condition that researchers have determined is caused by repeated blows to the head or experiencing many concussions. It's not diagnosable until someone dies.

Many speculate, though, that Brown's behavior changed drastically after a helmet-to-helmet hit. However, that hit was delivered by Vontaze Burfict of the Cincinnati Bengals.

Antonio Brown close up

Former Tampa Bay Buccaneers wide receiver Antonio Brown arrives courtside during the second half of an NBA basketball game between the Memphis Grizzlies and the Brooklyn Nets Jan. 3, 2022, in New York. (AP Photo/Adam Hunger)

Brown has been in and out of trouble both on and off the field in recent years. In the last game he played, he shed his jersey and pads and stormed off the sideline at MetLife Stadium and was almost immediately released by the Tampa Bay Buccaneers.

In December, he had domestic charges brought against him. Two months prior, he was ordered to pay a truck driver over $1 million for an alleged assault. Last month, he came under fire when his Snapchat account posted explicit content of the mother of his four children.

Antonio Brown last game

Tampa Bay Buccaneers wide receiver Antonio Brown wipes his face as he leaves the field after throwing his equipment into the crowd while his team was on offense during the third quarter of a game against the New York Jets Jan. 2, 2022, in East Rutherford, N.J.  (Andrew Mills/NJ Advance Media via AP)

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Brown remains a free agent. Harrison retired after the 2017 season.

Fox News' Chantz Martin contributed to this story.