It's the play Cowboys fans will never forget. 

On January 10, 1982, against the Dallas Cowboys, the 49ers trailed 27–21 in the final minute of play. San Francisco wide receiver Dwight Clark leaped and caught a 6-yard pass from quarterback Joe Montana in the back of the end zone to give the 49ers a 28–27 victory and advance to Super Bowl XVI. 

That play, one of the most famous in the history in the NFL, has been immortalized as "The Catch" you can relive the moment in the video below.

On Sunday Dwight Clark, 60 announced that he has been diagnosed with amyotrophic lateral sclerosis (ALS). Clark said he was diagnosed with the disease after visits to six neurologists and three ALS specialists.

You can read his statement below