31. 'One of the great mysteries' -- The story of three 49ers diagnosed with ALS

San Francisco 49ers legend Dwight Clark was recently diagnosed with ALS, sending shockwaves through the franchise and fan base. It also recalled memories of three 49ers teammates from the mid-1960s who were all diagnosed with ALS following their football careers. In this special edition of The 49ers Insider Podcast, Matt Maiocco explores the mysterious story of those three men -- Matt Hazeltine, Gary Lewis and Bob Waters. (Episode 31)