A woman was killed near the DC area, as well, some years ago when a rock was dropped onto her car from an overpass.
Her father rushed her to the nearest hospital where doctors saved her life. Later she underwent a series of painful operations to put her face back into something resembling normal.
As far as I know the police never found the perp but it wasn't through lack of trying... everyone in the area wanted his blood. He should have been whipped to death for what he did.