Wis. Stat. § 244.18: Agent’s resignation; notice.

Unless the power of attorney provides a different method for an agent’s resignation, an agent may resign by giving notice to the principal and, if the principal is incapacitated, to any of the following:

(1) To the guardian, if one has been appointed for the principal, and a coagent or successor agent.

(2) If there is no person described in sub. (1), to any of the following:

(a) The principal’s caregiver.

(b) Another person reasonably believed by the agent to have sufficient interest in the principal’s welfare.

(c) A governmental agency having regulatory authority to protect the welfare of the principal.