A young Oklahoma mother shot and killed an intruder to protect her 3-month-old baby on New Year's Eve, less than a week after the baby's father died of cancer.

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... 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.

Note that she was in the house and on the phone with 911 for 21 minutes while these aggressors were trying to break in. One keeps a weapon because the police are not there to protect you; they are there to catch bad guys after-the-fact. Via Okla. Woman Shoots, Kills Intruder: 911 Operators Say It's OK to Shoot - ABC News.