Here’s his written statement, courtesy of the 49ers P.R. department:
“In September of 2015, I started feeling weakness in my left hand. I was mildly paying attention to it because since my playing days, I’ve constantly had pain in my neck. I was thinking it was related to some kind of nerve damage because it would just come and go.
“After months of tests and treatment, I got some bad news. I was diagnosed with amyotrophic lateral sclerosis. I have ALS, also known as Lou Gehrig’s disease. Those words are still very hard for me to say.