Body of the crime.

The basic [or body] of facts [necessary to prove the existence of a specific crime]. This refers to evidence which can be used to convict a thief; such as, catching him with stolen goods; or proof in a murder trial of the actual death of the victim. It does not mean the body of the victim.

Another translation: "The terrible evidence that a crime has been committed." An example might be arson, in which the corpus delicti might be some proof (a gasoline can?) that the fire was set on purpose not just a burned-down building.

The facts and circumstances consisting of proof or evidence that a criminal act has been committed before anyone can be accused of a crime.