Exclusive video showed 39-year-old Errol Hillary struggling with a guard outside The Mansion nightclub in Mount Vernon on Sunday.
The guard got ahold of Hillary's gun and held him until police arrived.
Prosecutors say Hillary shot and killed club owner O'Neill Bandoo when he opened fire inside the club.
"We don't know how to go on without him right now. We're suffering, the children are suffering. Up until now, they hadn't opened their Christmas gifts, they're still waiting for their daddy to come home," said Erica Deaver, the victim's mother.
Bandoo left behind a wife and six children.
Four other people were wounded in the gunfire.
Authorities say the suspect is a Bronx resident who was charged with attempted murder in a May shooting.