Accomplice (noun)

A person who helps another person commit a crime or do something wrong.

Origin:

From old french, from latin accomplire to complete.

Examples:

1. The thief had an accomplice who helped him plan the robbery.
2. She was an accomplice in her husband's embezzlement scheme.
3. The murder suspect had an accomplice who provided him with an alibi.
4. The hackers had an accomplice inside the company who provided them with sensitive information.
5. The con artist had an accomplice who helped him in his scam.