A single-mother, home alone with her baby, calls 9-11 to ask if she can shoot a home intruder.

McKinley told ABC News Oklahoma City affiliate KOCO that she quickly got her 12 gauge, went into her bedroom and got a pistol, put the bottle in the baby’s mouth and called 911.

“I’ve got two guns in my hand — is it okay to shoot him if he comes in this door?” the young mother asked the 911 dispatcher. “I’m here by myself with my infant baby, can I please get a dispatcher out here immediately?”

The 911 dispatcher confirmed with McKinley that the doors to her home were locked as she asked again if it was okay to shoot the intruder if he were to come through her door.

“I can’t tell you that you can do that but you do what you have to do to protect your baby,” the dispatcher told her. McKinley was on the phone with 911 for a total of 21 minutes.

When Martin kicked in the door and came after her with the knife, the teen mom shot and killed the 24-year-old. Police are calling the shooting justified.

“You’re allowed to shoot an unauthorized person that is in your home. The law provides you the remedy, and sanctions the use of deadly force,” Det. Dan Huff of the Blanchard police said.

Stewart soon turned himself in to police.

When seconds count, the police are minutes away.

If this happened in New York or Washington, the mother would be prosecuted as a murderer in possession of a firearm.