Wolves returned to a sheep ranch north of Reed Point on Sunday and killed one ewe.
Wolves have killed livestock on the ranch in five previous incidents, the most recent in early October.
Federal Wildlife Services officials confirmed that wolves were responsible for the depredation. As a result, a permit allowing the rancher to kill one wolf was extended for 45 days, starting Sunday.
A total of 16 sheep and one goat on the same ranch have been confirmed killed despite the efforts of herders and guard dogs.