Although the term does not necessarily refer to a dead body, I've read that some states do require a dead body as corpus delicti evidence in order to prosecute a murder charge. Texas is one of them, maybe?
I read a book called The Murder Room about elite detectives that solve cold homicide cases as a hobby and just to make the world a better place. In one case, no body was found, so they thought they could not charge the suspect.
But ultraviolet light revealed huge quantities of blood in the apartment, and they were able to test some with DNA to show whose it was. Then they got experts to testify that no human could survive losing that much blood, and were able to go ahead and prosecute with the argument that all the blood was the equivalent of a body.