Houston police identified the two people killed as Patrick Prince and 30-year-old Brian Washington.
The Houston Chronicle reports ( http://bit.ly/1ebDTfB) the shooting occurred at about 2:15 a.m. on Wednesday near the Nox dance club in the city's historic Heights neighborhood.
Police say Prince and Washington were among patrons leaving the club when a heated argument erupted between them. Police say Prince shot Washington several times, and Washington returned fire once.
Houston police say Washington died at the scene. Prince died later at a Houston hospital. Police are looking for unknown suspects who took the guns.
Information from: Houston Chronicle, http://www.houstonchronicle.com