殺 (Kanji for kill) | KANJIDAMAGE

Onyomi

SATSU

I SAW TWO killers escape from the prison.

The killer threw the victim's body in a tree and left it there.

ころ*す	kill ★★★★☆

自殺(じさつ)

suicide ★★★★☆
自 (my own) + 殺 (kill) = 自殺 (suicide)

殺人(さつじん)

murder ★★★★☆
殺 (kill) + 人 (person) = 殺人 (murder)

Despite having "人" in it, this word just means the act of murder.
A murderER is a 殺人者 - satsujinMONO.

暗殺(あんさつ)

assassination ★☆☆☆☆
暗 (dark) + 殺 (kill) = 暗殺 (assassination)