One would-be Good Samaritan died and two others were hospitalized in critical condition, FOX 29 of San Antonio reported.
As for the gun-wielding driver, who was in her 20s or 30s, a nearby neighbor shot her dead after coming to the defense of the three Good Samaritans who were fired upon, FOX 29 reported.
Those shot by the suspect were a 50-year-old man who died at a hospital, a woman in her 50s and a male in his late teens, the report said.
The driver had been speeding when she crashed into a parked vehicle in the area, FOX 29 reported.
An investigation was underway, authorities said.