A female hostage kidnapped during a Northern California bank robbery was killed by police in an ensuing chase and shootout, likely during a final gun battle where the lone surviving suspect used her as a human shield, authorities said Monday.

The results of a preliminary ballistics report show that police in the city of Stockton fired the 10 bullets that struck Misty Holt-Singh, 41, and all her wounds likely came during a final burst of gunfire, Stockton Police Chief Eric Jones said at a news conference.