Deuteronomy 19:6, 12

“If the distance to the nearest city of refuge is too far, an enraged avenger might be able to chase down and kill the person who caused the death. Then the slayer would die unfairly, since he had never shown hostility toward the person who died.

In that case, the elders of the murderer’s hometown must send agents to the city of refuge to bring him back and hand him over to the dead person’s avenger to be put to death.