According to an announcement Tuesday by doctors from Boston University who had been studying the former football player's brain, Demaryius Thomas had a brain disease called chronic traumatic encephalopathy.

The death of Thomas was1-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-65561-6556 His family believed that Thomas's death may have been caused by his seizures. The cause of death has not been determined by the Fulton County Coroner's Office.

Dr. Ann McKee, who was part of the Boston University research team, said the most likely cause of Thomas' death was a seizure.

It is notCTE that causes death. You don't die from chronic traumatic encephalomyelitis. Your behavior and personality are affected by the disease.

In addition to the seizures which began in 2020, Thomas also struggled with what has come to be known as common conditions associated with chronic traumatic encephalomyelitis: memory loss, paranoia, and other erratic behavior, especially in the last year before he died.

Thomas' mother told ABC News that he was isolated sometimes. I don't know what's happening with my body," he said. He said that he didn't feel like himself anymore.

Thomas played 10 seasons in the NFL after being drafted in the first round. He was with the Broncos for 812 seasons and won two Super Bowls. The four-time Pro Bowl receiver played for the Houston Texans and New York Jets before retiring.

Thomas retired from the National Football League.