Sarah McKinley

A US woman who shot dead an intruder after asking the emergency services for permission will not face charges, but the man's alleged accomplice will.

"I've got two guns in my hand. Is it OK to shoot him if he comes in this door?" McKinley asked the dispatcher.

"Well, you have to do whatever you can do to protect yourself," the dispatcher is heard telling McKinley. "I can't tell you that you can do that, but you have to do what you have to do to protect your baby."

Oklahoma law allows the use of deadly force against intruders, and prosecutors said McKinley clearly acted in self-defense. According to court documents, Martin was holding a knife when he died.

McKinley said 21 minutes after the suspects arrived at her Blanchard home, Justin Shane Martin, 24, broke through the door, which she had barricaded with a couch. She shot him with a 12-gauge shotgun.