亡くす

なくす · nakusu · JLPT N3 · verb-godan

to lose someone

🕯️ 亡 = death, as in 亡くなる (to pass away): to lose someone to death

The kanji 亡 means perish or deceased. 無くす, read the same way, means losing a thing such as keys. Write it with 亡 when it is a person who is gone.