Police say 39-year-old Errol Hillary open fired on a crowd at "The Mansion" in Mount Vernon.
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One of the security guards tackled Hillary and held him until police arrived.
He described the moment he stepped into action.
I was actually standing right in front of him when he started shooting," the security guard said, "I said, 'You know what, I got to jump on him.' So I jumped on him, you know to try to stop him from shooting anyone else."
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The shooting killed the club's owner O'Neal Bandoo.
Eyewitness News spoke to his mother at an anti-gun violence event near the scene.
She said Bandoo's death has been hardest on his six children.