Felon (noun)

1. A person who has committed a serious crime, especially one who has been convicted and sentenced to serve time in prison.
2. A person who has committed a felony.
3. A person guilty of a serious crime.

Origin:

Middle english felon, from old french felon, from latin felōn-, felō, from fel; akin to greek phallein to strike — more at blow.

Examples:

1. He was convicted of murder and sentenced to life as a felon.
2. He is a convicted felon and cannot vote.
3. After serving his time as a felon, he was released from prison.
4. The police are searching for a known felon who escaped from jail.
5. The law prohibits convicted felons from owning guns.