Life Sentence
noun
Until the end of somebody, you will be punished. If you are punished to your end, you are being given a life sentence.
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.