Which is the first recorded murder in the history of humans?
Well scientists did discover a skull that is proof of a murder that took place about 430,000 years ago. Someone apparently took a bludgeon of some sort and whacked another person upside the head twice (thus the intent to murder and kill), and then threw the body in a pit, where it stayed for hundreds of thousands of years.
Meanwhile, if you're looking for what's more commonly thought of as the first murder, it would probably be the murder of Abel by his brother Cain, as referenced in the Bible.(Although this could be a made up story as well, told as an analogy to support the moral treatment of others and help solidify the belief that without God, man is inherently evil.)