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Crime Alert, I'm Nancy Grace, breaking crime news now.

Caitlin Lee, 25, has a friend over at the apartment she shares with her three children.

Caitlin and the girlfriend are filming a tick-talk in the kitchen, and they hear a banging on a window.

While the friend is still filming, Caitlin walks to the window.

She asks, what are you doing here before three gunshots ring out shattering the window?

The video quickly cuts off as Caitlin falls to the ground.

Caitlin's friend spots Caitlin's ex-boyfriend, Joshua Thompson, running away.

Nancy Caitlin had moved three times in four months because she was so afraid of Thompson.

Thompson had previously been arrested for domestic battery against

Caitlin and she had been granted an emergency protection order against him.

Thompson called his brother shortly after the shooting confessing to killing

Caitlin.

Thompson's brother urged him to call 911

and Thompson turned himself in.

...