The Union City Police Department. (Union City Police Department)
Per the report, two women had already been attacked and the suspect had begun stabbing a third victim when Dobbs stepped outside.
Responding officers found a female with stab wounds lying between cars. Another woman who had stab wounds and the suspect, who with gunshot wounds, were found behind the apartment, police said.
Cpt. Prentice Brooks said an onlooker had seen the assault taking place and stepped up to stop the threat.
"He did shoot the suspect," Brooks said. "We actually commend him for what he did and stepping up."
Dobbs told FOX 5: "I just couldn’t sit there and watch and hear what was going on."
One of the women died from her stab wounds. The suspect, meanwhile, was taken to the hospital where he died from his injuries.
The violence appeared to stem from a domestic dispute. An investigation is ongoing.