The incident unfolded just after 10 p.m. Wednesday near Soto Street and Wabash Avenue, according to the Los Angeles Police Department.
The suspected robber pulled a gun on a man who was eating at a taco truck. That man then pulled out his own gun and shot the robber multiple times.
The robbery suspect, identified as a 26-year-old man, died at the hospital.
Police say the other man drove off after the shooting, and they're now looking for him.