殀
ヨウ, わかじに
dying young
JLPT0 G13 S0 F5000
As per
夭
# (slender and limber) +
歹
severed bone/death → *die young/prematurely* (i.e. when one is still slender and limber) → *kill* (another in his youth).
[Full Kanji Etymology List]