An agency is terminated as to every person having notice of the termination by: (1) the expiration of the agency's term; (2) the extinction of the agency' subject; (3) the death of the agent; (4) the agent's renunciation of the agency; or (5) the incapacity of the agent to act as an agent.
Circumstances That Terminate Agency
Mont. Code Ann. § 28-10-801, under Termination of Agency.
Mont. Code Ann. § 28-10-801