The San Jose Mercury News picks up the details that were first revealed on his blog.
“I have ALS, also known as Lou Gehrig’s disease,” the legendary 49ers wide receiver wrote. “Those words are still very hard for me to say.”
Clark was diagnosed with amyotrophic lateral sclerosis in late 2015, he wrote, after visits to six neurologists and three ALS specialists. …
“I’ve been asked if playing football caused this. I don’t know for sure. But I certainly suspect it did,” he wrote. “And I encourage the NFLPA and the NFL to continue working together in their efforts to make the game of football safer, especially as it relates to head trauma.”