A family argument ended by firing two bullets into his sleeping 13-year-old half-sister’s brain — then trying to do the same to his mother. Steven Murray, 28, then opened fire on cops — and managed to survive the 84-shot blizzard of bullets they fired as he fled on foot toward a Harlem highway. Click below to read the rest of the story.

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When detectives showed mom Christine Fryar a photo of the gunman while she was being treated for a forehead wound, she identified him with hatred in her voice.

“That’s my son. That’s the animal who shot me and killed my daughter,” she said, according to a police source.

The eruption of violence capped a tense three weeks in the 12th floor apartment at the Polo Grounds houses.

Murray, whose rap sheet includes two assaults on cops, had moved in with Fryar, 44, and her seventh-grade daughter, Annie, after moving from North Carolina several weeks before.

The mother felt like Murray was just loafing around and wanted him out. Annie, a well-liked, diligent student, tried to play peacemaker.

At 5 p.m. on Monday, Murray and Fryar were at it again. Annie, hanging out with pals from Public School 46, abruptly left for her apartment.

“She said, ‘Let me go upstairs before things get out of hand. …They’re going to start arguing because my brother’s drunk,’” Donette Skinner, 13, recalled.

“I walked her to her building, then I went home. I didn’t think it was going to get carried away.”

Apparently, things calmed down. But at 2 a.m., while Annie dozed face-down on the pullout sofa in the living room, mother and son began arguing again.

She fled into her bedroom and Murray allegedly pulled out a .22 caliber pistol and plugged Annie with two shots — one in her right temple, one near her right eye.

Fryar rushed into the living room.

“You shot my daughter,” she cried out, according to her upstairs neighbor.

Murray wasn’t done, cops say. He fired at her and she ran back into the bedroom. When she opened the door again, he was reloading and she ran back inside.

She had been hit in both hands and the forehead but was miraculously not killed. The bullet traveled under the skin of her head and lodged near her ear.

When police arrived, Fryar gave them a description of her son, which was put out over the radio.

Downstairs, a sergeant and a police officer spotted Murray running down a path next to the Harlem River Drive off-ramp, just north of W. 155th St.

Witnesses heard the cops tell the suspect to stop.

“The cop was saying, ‘Put the gun down!’” said Annette Cordero, 25, who lives at the nearby Rangel Houses. “He said it a couple of times.”

DN