Lifer (noun)

A prisoner serving a life sentence.

Origin:

Slang term, from the phrase life sentence.

Examples:

1. He is a lifer, he will never get out of prison.
2. The lifer had been in prison for over 20 years.
3. The lifers are kept in a separate section of the prison.
4. The lifer was sentenced to life without parole.
5. The lifer had committed a murder.