Beloved former KDKA-TV personality Jon Burnett has suspected CTE

Jon Burnett was one of Pittsburgh 's favorite on-air personalities for 36 years .

Burnett retired five years ago when he was 65 , but many people don't know he's been facing some major health challenges.

His neurologist says he has suspected CTE , chronic traumatic encephalopathy.

Jon Burnett is part of research at the National Sports Brain Bank at the University of Pittsburgh .

Doctors don't know why some people with head injuries get CTE and others don't, how to prevent it while still playing contact sports.

They need any athlete who played a sport with a higher risk of head injury to participate in their study.