A mother in her late teens protects herself and her infant son from an intruder on New Years Eve.

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The mother, Sarah McKinley of Blanchard, Oklahoma, shot and killed Justin Martin as he came into her home and came at her with a hunting knife ABC News reports.

The deadly encounter occurred about a week after the young mom's husband died of cancer, according to TV station KOCO. Martin darkened McKinley's door on the day of her husband's funeral, several days before the shooting. He claimed he was a neighbor who wanted to say hello, but she didn't open the door.

Martin then returned on December 31 with an accomplice and when he tried to force entry into the house McKinley heard and called 911. She went into her own bedroom where she had a 12-gauge shotgun and a handgun. To calm her son, she gave him a bottle all the while watching the door.

"I've got two guns in my hand -- Is it okay to shoot him if he comes in this door?" McKinley asked the 911 operator. "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 McKinley when she asked a second time. The call went on for 21 minutes as the men powered their way into McKinley's house.