what kind of disease does tim thayer have in dallas or

I can’t confirm that Tim Thayer has any disease from the information available here. The most relevant public result I found identifies a Tim Thayer as a cardiologist at Vanderbilt, not someone tied to a known illness in Dallas, Oregon.

If you meant a different Tim Thayer, or a specific local person in Dallas, Oregon, I’d need more identifying details to avoid guessing.