Former NFL Player Demaryius Thomas , Had CTE, Family Says.<br />CNN reports upon his death late last year, former NFL player Demaryius Thomas suffered from stage 2 CTE, according to his parents.<br />Per a recent news release, Thomas' parents say the diagnosis came after officials examined the former star's brain.<br />Thomas suffered from seizures that <br />halted his decorated NFL career. <br />He died from cardiac arrest.<br />Thomas was only 33 years old.<br />CTE, or chronic traumatic encephalopathy, <br />is the degeneration of the brain after <br />repeated trauma to the head.<br />It is often found in the brains of those who play football and other contact sports.<br />On the basis of multiple lesions <br />in the frontal lobes and temporal lobe are beginning degeneration of deeper areas of the brain. , Dr. Ann McKee, professor of neurology and pathology at Boston University, via CNN.<br />He was diagnosed <br />with CTE, stage two. , Dr. Ann McKee, professor of neurology and pathology at Boston University, via CNN.<br />Thomas' parents say their son started displaying symptoms of CTE in the months preceding his untimely death.<br />His mood would change, and he would also isolate himself sometimes. , Katina Stuckey Smith, mother of Demaryius Thomas, via CNN.<br />He was like, ‘Mom, I don’t know what’s going on with my body. I gotta get myself together.’ , Katina Stuckey Smith, mother of Demaryius Thomas, via CNN