ALBUQUERQUE, N.M. – Mathias Neal, 21, from Sheep Springs, New Mexico, and an enrolled member of the Navajo Nation, pleaded guilty in federal court on June 3 to an information charging him with second degree murder in Indian Country. According to his plea …ALBUQUERQUE, N.M. – Mathias Neal, 21, from Sheep Springs, New Mexico, and an enrolled member of the Navajo Nation, pleaded guilty in federal court on June 3 to an information charging him with second degree murder in Indian Country. According to his plea …