“kill” in Japanese is 殺, read satsu, sai, koro (さつ, さい, ころ). It is a Grade 4 Kyōiku kanji, taught in year 4 of Japanese elementary school, and appears in words such as 殺人 (murder).
What does 殺 mean?
虫を殺すのはかわいそうだ。
Same sound, different character — the classic trap. Compare them side by side: