Demaryius Thomas’s Death Was Caused by Seizure Disorder

Demaryius Thomas played 10 seasons in the N.F.L. with three teams: the Denver Broncos, the Houston Texans and the Jets.Credit...Jack Dempsey/Associated PressDemaryius Thomas, a four-time All-Pro receiver with the Denver Broncos, died of complications from seizures, the medical examiner in Fulton County, Ga., said Sunday.

Thomas died Dec. 9 at his home in Roswell, Ga., less than six months after he retired from the N.F.L. He was 33.

In July, doctors at Boston University who examined Thomas’s brain found that he had C.T.E., or chronic traumatic encephalopathy, the degenerative brain disease associated with repeated head hits. The disease, which can only be posthumously diagnosed, does not cause…