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An accomplice is defined as a person who knowingly, voluntarily, or intentionally gives assistance to another in (or in some cases fails to prevent another from) the commission of a crime. An accomplice is criminally liable to the same extent as the principal. An accomplice, unlike an accessory, is typically present when the crime is committed. 

Jurisdictions will sometimes differ as to the definition for knowingly. Generally, knowingly is enough for the person to be aware of a specific fact. For instance, in the Court of Appeals case, State v. Allen, the court instructed the jury that a person acts “knowingly” with respect to a fact or circumstance when they are aware of that fact or circumstance. 

See, e.g. Waddington v. Sarausad, 129 S.Ct. 823 (2009)

See also: accomplice witness

[Last updated in June of 2022 by the Wex Definitions Team]