(CNN)Former San Francisco 49ers wide receiver Dwight Clark died Monday at age 61 after a battle with amyotrophic lateral sclerosis, or ALS.
Former 49ers great dies after battle with ALS
His wife, Kelly, announced his passing on Clark's verified Twitter account: "I'm heartbroken to tell you that today I lost my best friend and husband. He passed peacefully surrounded by many of the people he loved most. I am thankful for all of Dwight's friends, teammates and 49ers fans who have sent their love during his battle with ALS."