Homicide: Unjustifiable, Described as Killing by Accident
Source: TTT
Numbers 35:23
or without looking drops a heavy stone that kills him, but he was not an enemy and did not intend to harm him,
Deuteronomy 19:5
If he goes into the forest with his neighbor to cut timber and swings his axe to chop down a tree, but the blade flies off the handle and strikes and kills his neighbor, he may flee to one of these cities to save his life.