Evidence in a murder mystery typically refers to physical evidence such as fingerprints, DNA, or other physical objects that can be used to identify the perpetrator of a crime. The most common type of evidence in a murder mystery is the BODY of the victim, which can provide clues about the cause of death and the identity of the killer. In a crossword puzzle, the term 'BODY' would refer to the four-letter word that describes the physical remains of the victim.