Charles Ellicott Commentary Numbers 35:17

"And if he smote him with a stone in the hand, whereby a man may die, and he died, he is a murderer: the murderer shall surely be put to death." — Numbers 35:17 (ASV)

And if he smite ... — Better, And if he struck ...

With throwing a stone. —Literally, with a stone of the hand — i.e., a stone held in the hand, whether thrown or used as the weapon of wood (Numbers 35:18).

And he die. —Better, and he died.