'Killers' in the Bible

So they gave Hebron to the descendants of Aaron the priest to serve as a city of refuge for unintentional killers, along with its pasture lands, Libnah with its pasture lands,

Shechem was allocated to them as a city of refuge for unintentional killers, along with its pasture lands, in the mountainous region of Ephraim, Gezer with its pasture lands,

To the descendants of Gershon (one of the Levitical families) from the half-tribe of Manasseh were allocated Golan in Bashan as a city of refuge for unintentional killers, along with its pasture lands, and Beeshterah with its pasture lands, for a total of two cities.

Has the LORD struck them down, just as he struck down those who struck them? Or have they been killed, just as their killers were killed?

I heard a cry like that of a woman in labor, anguish like one giving birth to her firstborn, the cry of the daughter of Zion gasping for air, stretching out her hand: "Woe is me! I'm about to faint in front of killers!"