john's former co-host, kristine sorensen, spoke to john and his family to help everyone better understand cte and help people who may face it. (doorbell ringing) - sorry, we don't want any. (kristine laughing) - he's crazy, as always. aww, how are you? i missed you. john burnett and i are more than former colleagues and co-hosts, we're true friends. do you like to come out here a lot? - i do, yes. - aw. (laughs) as we've gotten together since he retired, i've seen his short-term memory worsen, as well as his walk and his voice. - well, i've spent some of my time wishing that my voice wasn't gone. it's just, this is the best i can do. this is a good day. my wife, debbie's here. deb, what is wrong with me? what's wrong with my throat? - [kristine] john asks his wife of 48 years, debbie, to help him remember a lot of things, and through it all, he understands what's happening. - [john] oh, she's my brains. somebody would have to be. - [kristine] john's short-term memory has been declining for 10 years, but other symptoms have gotten worse in the last two, including shuffling and reduced faci