lifer

A prisoner serving a life sentence.

One who has spent an entire career working in a given field or in a single organization, especially in the military.

One who receives or has received a sentence of penal servitude for life.

A prisoner sentenced to life in prison.

A person who makes a career in the military.

A bird species seen for the first time by a birder who is keeping a list of all the birds he or she has seen in their life time.

a prisoner serving a term of life imprisonment