HOUSTON — An off-duty deputy working security at a Houston nightclub fatally shot an armed suspect after gunfire at the club left one other person dead and wounded two more people, police said.

Shots were fired at about 1:15 a.m. Monday, and police said one person was pronounced dead at the scene. A second person was struck several times and is in critical condition, police said, while a third person was treated for a gunshot wound to the leg.

A Harris County deputy who was working security opened fire after the shooting, killing “an armed suspect,” police said. Authorities were still working to determine whether anyone else opened fire at the nightclub. Police did confirm Monday that the “armed suspect” was among the two dead at the club.

Names of those involved had not been released Tuesday.

Harris County Sheriff Ed Gonzalez said Monday that several deputies were working off-duty as security at the time, but none was injured.