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important. a 72-year-old suspect who was found dead at the scene about 12 hours later from what officials believe at this point was a self-inflicted gunshot wound. but there's more to the story. nbc news now on staining this new and exclusive surveillance video that actually shows the moment when an apparent hero helped disarm what is believed to be that suspected gunman, and then this person speaking at it with lester headlight. >> i had to believe that i was going to die. like, my life was ending here at that very moment. but something -- something amazing happened, and a miracle a...

i'm jim sciutto. >> and i'm erica hill. investigators in monterey park, california searching for a motive after a gunman killed ten people and wounded ten more at a dance hall. the gunman later took his own life after a standoff with officers officers. >> before it ended, he did try to target a second dance hall. he was stopped by a bystanders, brandon tsay, who managed to wrestle the gun away from him. >> my first thoughts was i'm going to die here. this was it. when i got the courage, i lunged at him with both of my hands and grabbed the weapon, and we had a struggle. we struggled ...