Man who disarmed Monterey Park shooter speaks out: 'Something came over me'

The night was winding down after a Lunar Near Year celebration at the Lai Lai Ballroom & Studio in Alhambra, California, on Saturday, when Brandon Tsay heard the front door click close behind him.

"That's when I turned around and saw that there was an Asian man holding a gun. My first thought was I was going to die here, this is it," Tsay, 26, told ABC News' Robin Roberts during an interview Monday on "Good Morning America."