So I've been reading about this strange case in Phoenix, in which a man was tasered to death by police after he nearly killed his three-year-old daughter in what was apparently an exorcism attempt. You can listen to some of the 911 calls here, and twice - just after the 0:50 mark, and again after the 1:35 mark - what sounds like a low, hungry growl creeps into the audio.

It's probably just a sound glitch, but it's creepy as hell. Literally.

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