One of the all-time greats of the Penn State backfield, Larry Johnson made a name for himself in Beaver Stadium, and later on in his pro career with the Kansas City Chiefs, for his hard-nosed running style that led him to first team All-American honors with the Nittany Lions.

Years after the end of his NFL career in 2011, Johnson said on Twitter Friday that he is living with CTE — a degenerative brain disease that’s been found in a number of football players after their deaths.

Johnson tweeted after news came out this morning that former New England Patriot star Aaron Hernandez, who was convicted of murder and committed suicide in April after spending years in prison, had CTE.

If he had it. I know for certain I’m living with it. Even if he had the chance to test for it, they still wouldn’t of found it. https://t.co/2QnD6VW8Ec

— Larry Johnson (@2LarryJohnson7) September 22, 2017

Not once have I made an excuse nor excused his behavior over CTE. IM AMAZED 27 YEAR OLDS CAN GET IT! GOT IT!?

— Larry Johnson (@2LarryJohnson7) September 22, 2017

(2) None of us!!! Knew the impact of it all. So your “we cashed a paycheck” arguement is dead. CTE is only public way after I stopped

— Larry Johnson (@2LarryJohnson7) September 22, 2017

CTE can only be tested for after a person is dead. In a study from Journal of the American Medical Association that included 111 deceased NFL players, 110 were diagnosed with the disease after death.