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The officer -- whose name hasn't been released -- was taking a nap at home around 2:30 p.m. Tuesday when he heard breaking glass coming from downstairs, according to Phoenix police.

The cop went down there with his firearm, and found this uninvited teenager in his home "armed with a large rock," police say.

After giving the teenager commands to drop the rock, police say the kid instead cocked his arm back as if he were going to throw it at the officer, and the Tolleson cop put a bullet in the intruder's head.