JERSEY CITY, NJ (CNN) - A New Jersey police officer was shot and killed while responding to a store robbery Sunday morning.
Authorities say officer Melvin Santiago was shot in the head before he made it out of his patrol car.
Santiago was pronounced dead at the hospital.
Investigators say an armed security guard told police the suspect struck him and took his weapon.
Police said they believe the guard's weapon was used in the shooting.
They say the suspect was fatally shot in the ensuing shootout.
His identity has not yet been released.
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