Offender (noun)

1. A person who has committed a crime or broken a law.
2. A person who causes harm or injury to others.

Origin:

From offend, from old french offenser, from latin offendere 'strike against'.

Examples:

1. The offender was sentenced to life in prison.
2. The company was fined for being a repeat offender of environmental regulations.
3. The offender apologized for his actions.
4. She was the victim of an offender in a violent crime.
5. The offender's actions were seen as a betrayal of trust.