A female gray wolf was reported dead in northwest Colorado this week, becoming at least the seventh of the state’s reintroduced wolves to die. Colorado Parks and Wildlife did not indicate in its news release what may have caused the animal’s death but said a final determination will be made after a necropsy.

Colorado Parks and Wildlife confirmed the death of the fourth gray wolf this year. Officials said the female gray wolf, 2512-BC, died in northwest Colorado on May 15. The U.S. Fish and Wildlife Service is investigating her death.

Colorado Parks and Wildlife says two wolves introduced to the state from British Columbia that were shot and killed in Wyoming and a third that was found dead in Rocky Mountain National Park were