What is the term for the knowledge of and failure to report a homicide's concealment?

The term that specifically refers to the knowledge of and failure to report a homicide's concealment is indeed "Concealment of a homicide." This term captures the idea that an individual is aware that a homicide has occurred and is intentionally hiding or failing to disclose this information. In legal contexts, failure to report a crime, especially one as serious as homicide, can carry significant consequences. The term illustrates the culpability that comes with knowingly withholding information pertaining to a serious crime, which can complicate legal proceedings and investigations.

In contrast, the other options refer to different concepts. An accessory after the fact refers to someone who assists a perpetrator after the crime has been committed but does not imply the concealment of the crime itself. Failure to report could imply general negligence or a lack of action in reporting various incidents but does not precisely address the specific context of homicide concealment. Negligence usually pertains to failure to exercise appropriate care in a given situation, but it does not specifically relate to the act of concealing a homicide. Thus, understanding the precise terminology is essential in legal discussions relating to criminal accountability and the responsibilities of individuals who gain knowledge of serious offenses.