Demaryius Thomas — a two-time All-Pro wide receiver and Super Bowl champion — was found dead Thursday night at his home, according to police. He was 33.

“Preliminary information is that his death stems from a medical issue, and our investigators currently have no reason to believe otherwise,” said Officer Tim Lupo, public information officer for the police department in Roswell, Georgia.

Thomas’ cousin — LaTonya Bonseigneur — told the Associated Press that he had been suffering from seizures and the family believes these symptoms were the cause of death.