The Brave One (2007)

Erica Bain is a happy radio host from a city she loves and with a fiancé she adores. However, a brutal attack in New York's Central Park changes her life forever, leaving her in a coma for 3 weeks and her fiancé dead. In an attempt to feel safer after the attack, she buys a gun. However New York does not feel the same as it did anymore and Erica has several encounters where she is not afraid to use her new gun. Everyone is talking about a vigilante and Erica is forced to talk about them too on her radio show...