LXX Num 35:17

ἐὰν δὲ ἐν λίθω ἐκ χειρὸς ἐν ᾧ ἀποθανεῖται ἐν αὐτῷ πατάξῃ αὐτόν, καὶ ἀποθάνῃ, φονευτής ἐστιν· θανάτῳ θανατούσθω ὁ φονευτής.

Or if anyone has in his hand a stone of deadly size, and he strikes and kills another, he is a murderer; the murderer must surely be put to death.