Call it "CSI: Prehistory." Scientists have uncovered what may be the world's oldest murder case. The victim was bashed in the head -- twice -- and then tossed into a pit deep inside a cave system in Spain. And it happened 430,000 years ago, during the Middle Pleistocene era. Here's a look at the evidence, examined by a team of researchers led by paleontologist Nohemi Sala of Madrid's Centro Mixto UCM-ISCIII de Evolucion y Comportamiento Humano. (Story continues below image.) As seen in the image, there are two cracks in the skull above the left eye. “Either one of them could have been lethal because they would have penetrated the brain,” paleoanthropologist Rolf M.