Late NFL, Georgia Tech football player Demaryius Thomas had Stage 2 CTE, researchers say

EAST RUTHERFORD, NEW JERSEY - NOVEMBER 24: (NEW YORK DAILIES OUT) Demaryius Thomas #18 of the New York Jets in action against the Oakland Raiders at MetLife Stadium on November 24, 2019 in East Rutherford, New Jersey. The Jets defeated the Raiders 34

The Boston University CTE Center confirmed Tuesday that former Georgia Tech football standout and NFL star Demaryius Thomas had Stage 2 CTE when he died suddenly in December 2021. 

Thomas was 33 years old when he was found dead in his home in Roswell. Police said at the time he died from a medical issue. 

Thomas' family donated his brain to the Boston University CTE Center. In a statement, Boston University researchers said they noticed signs of the disease in Thomas' brain. 

Thomas died about six months after announcing his retirement from professional football. The Fulton County Medical Examiner has made no official determination of the cause of Thomas' death, but doctors in Boston told the New York Times he most likely died after a seizure.

It's still not clear, however, if C.T.E. ultimately led to Thomas' other medical problems.

"He had two different conditions in parallel," Dr. Ann McKee, a Boston University neuropathologist told the New York Times.

Relatives told the Associated Press Thomas suffered from seizures more than a year prior to his death. His family told Boston University researchers Thomas' anxiety, depression, apathy and memory lapses worsened leading up to his retirement.

Stage 2 C.T.E. is associated with progressive behavioral, cognitive and mood abnormalities. In its worst stages, CTE is associated with dementia. 

The Boston University CTE Center has a goal of developing a diagnostic test for CTE in living patients. 

Researchers have studied more than 1,200 brains of former football players. A 2017 study published in the Journal of the American Medical Association found CTE in 99% of brains obtained from NFL players, 91% of college football players and 21% of high school football players.

Thomas came to Georgia Tech from West Laurens High School in Dexter. He spent three years with the Yellow Jackets football team before the Denver Broncos drafted him in the first round of the 2010 draft. He played 10 NFL seasons, most in Denver where he helped the Broncos to win Super Bowl 50.