Idaho suspect arrested in Pennsylvania on first degree murder charges
Anderson Cooper 360
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The DNA of the Crime Scene
Pamela Costello: They don't need the smoking knife, they've got DNA who allegedly has DNA that puts the suspect on the scene. But the murder weapon would be good to have," she says. Costello: The killer brought a edged weapon with a fixed blade, which shows, you know, that they intended to use it for something at that time.
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