The Axeman of New Orleans
Between 1918 and 1919, New Orleans was under the grip of terror thanks to the Axeman. The killer murdered at least 15 people, including a young mother carrying her child. Despite leaving evidence in the form of a bloody axe at every scene, the killings just stopped and he was never found.
The Black Dahlia Murder
This might be one of the most famous unsolved murders in US History. In 1947, young actress Elizabeth Short was found murdered but that wasn’t the worst of it. Short was nude, cut in two and had her mouth slashed and drained of blood. While the framing of the murder certainly seemed like the work of a serial killer, the murder was never copied and the killer or motive were never found.