Perpetrator (noun)

1. A person who commits a crime or does something wrong or harmful.
2. A person who carries out or is responsible for a crime or an act of violence.
3. A person who is guilty or responsible for a wrong or illegal act.
4. A person who causes or perpetrates something, especially something wrong or harmful.
5. A person who engages in illegal or unethical activities.

Origin:

Late 19th century: from latin perpetrator "doer, accomplice", from perpetrare "carry out".

Examples:

1. The police are searching for the perpetrator of the robbery, who is still at large.
2. The perpetrator of the bombing was later found to be a member of a radical extremist group.
3. The company is investigating the perpetrator of the data breach, which affected thousands of customers.
4. The perpetrator of the fraud was eventually caught and charged with multiple counts of embezzlement.
5. The perpetrator of the cyberattack was tracked down to a single IP address in a foreign country.