Deuteronomy 19:6

19:6 Otherwise the blood avenger will chase after the killer in the heat of his anger, eventually overtake him, and kill him, though this is not a capital case since he did not hate him at the time of the accident.

Deuteronomy 19:12

19:12 The elders of his own city must send for him and remove him from there to deliver him over to the blood avenger to die.