Former Broncos WR player Demarius Thomas died of complications from a seizure disorder, according to an autopsy.

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Former Denver Broncos An autopsy on the recipient Demarius Thomas revealed that he died from complications of a seizure disorder.

Thomas was 33 years old when he died Dec. 9, 2021just over two weeks before his birthday.

It turned out that the 10-year veteran of the NFL Stage 2 chronic traumatic encephalopathy, a degenerative brain disease, at the time of his death. However, the Fulton County Medical Examiner did not see a link between the two diagnoses.

CTE does not directly cause death.

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The autopsy also showed traces nicotine and marijuana in his system, but none of them played a role in his death.

Thomas started having seizures after a car accident in 2019, and friends and family noticed a change in his behavior.

Demarius Thomas of the Denver Broncos celebrates a touchdown during a 2015 AFC Divisional Playoff game against the Indianapolis Colts at Sports Authority Field in Mile High in January.  November 11, 2015 in Denver, Colorado.

Demarius Thomas of the Denver Broncos celebrates a touchdown during a 2015 AFC Divisional Playoff game against the Indianapolis Colts at Sports Authority Field in Mile High in January. November 11, 2015 in Denver, Colorado.
(Harry Howe/Getty Images)

FORMER NFL STAR DEMARIUS THOMAS HAD A STAGE 2 CTE, FAMILY SAYS

“His mood changed and he also isolated himself at times,” his mother, Katina Stucky Smith, told ABC News. “Demarius told me he was like, ‘Mom, I don’t know what is happening to my body. I have to get myself together.” And he said, “I don’t feel like myself anymore.”

Thomas was a four-time professional bowler., having played in two Super Bowls and winning one. He gained at least 1,000 receiving yards in five consecutive seasons from 2012 to 2016.

Tribute to the late former Denver Broncos wide receiver Demarius Thomas at Empower Field At Mile High, December.  February 12, 2021 in Denver, Colorado.

Tribute to the late former Denver Broncos wide receiver Demarius Thomas at Empower Field At Mile High, December. February 12, 2021 in Denver, Colorado.
(Justin Edmonds/Getty Images)

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He played 8½ seasons with the Broncos before ending the 2018 season with the Broncos. Houston Texans. He played for the New York Jets in 2019. He signed with the New England Patriots but never played for them in regular season games.