A fight broke out among several people at the party just before 6:30 p.m. in the 4700 block of Majestic Street. According to investigators, the suspect then got a rifle from his/her car and began shooting.
A father and his 20-year-old son were both shot. The father died, and the son - whose current condition is not known - was taken to Ben Taub.
Police say a third person might have been shot and left the scene before first responders arrived.
Investigators have not yet identified the suspect.
No other details have been released.