Montclair police said in a statement that officers saw the man leave the Target through a fire exit Sunday night with two large TVs then run to a green Honda Accord that awaited him.
Police say the woman driving the Accord would not stop and instead fled at high speed onto Interstate 10 and was attempting to get off the freeway in neighboring Claremont when she ran into three vehicles.
The man was ejected from the back seat and pronounced dead at the scene. The woman was taken to a hospital in police custody.
Two people from the other vehicles complained of pain and were hospitalized.