Life Sentence
Life Imprisonment
noun
Until their end, somebody is being punished. If they're being punished until their end, they've probably been given a life sentence, aka life imprisonment.
This is a jukugo word that uses the on'yomi readings of the kanji. You should be able to read this on your own.
終身刑を言い渡されたのは初めてです。
This is the first time I've been given a life sentence.