The incident happened at about 9:30 p.m. Saturday at a home in the 9600 block of Juniper Street.
Officials said a dark-colored vehicle pulled up and someone from inside opened fire on a group of people attending a barbecue in the backyard.
One man died on the scene. A 16-year-old boy was rushed to a nearby hospital where he died from his injuries.
Two other people were shot.
Their conditions have not been released.
