WHITE SETTLEMENT, Texas (CBSDFW.COM) — A North Texas church’s livestream caught the moment an armed gunman opened fire, killing one person and critically injuring another Sunday morning.

Just before 11 a.m. Dec. 29, police responded to a shooting at the West Freeway Church of Christ on Las Vegas Trail, where the service was being live streamed on their website.

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In the video, the gunman walked up to a server during communion with a shotgun, shot two people, then turned around and aimed at the pastor but missed as he was shot in action by a church security team member.

Officials confirmed at a news conference Sunday afternoon that the suspect was one of the two people killed. His identity has not yet been released.

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MedStar said the man in critical condition is currently undergoing surgery. Two other victims were injured trying to duck and cover but have been treated and released.

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None of the victims’ identities have been made known at this time.