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.

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. The female wolf was one of 15 relocated from Canada to Colorado in January.