Who is considered an accessory in criminal law?

An accessory in criminal law is defined as someone who supports or aids a principal offender with knowledge of the crime being committed. Specifically, this means that a person who has knowledge of a felony and assists the principal by providing help or support, whether before or after the crime, is considered an accessory. This role highlights the complicity involved in criminal activities, where the accessory's knowledge and aid contribute to the commission of the crime, even if they did not directly participate in the act itself.

The other options do not align with the legal definition of an accessory. For instance, a person who directly commits the crime is classified as a principal, not an accessory. Similarly, someone who testifies against another does not fall under the accessory definition, as their role typically involves cooperation with law enforcement rather than aiding in criminal activity. Lastly, a person who is unaware of the criminal act cannot be considered an accessory, as the lack of knowledge excludes them from the culpability required for that classification.