Check the original power of attorney. The power of attorney defines the relationship between yourself (the agent) and the person who granted you the power of attorney (the principal), and can be quite comprehensive. If the original power of attorney provides a process for resigning as agent, follow those steps. Generally, you will be required to submit some form of written notice to the principal.
Draft a resignation notice. Many states requires you to inform the principal in writing of your intent to resign as agent. Even if your state does not require written notice, it is a good idea to place your resignation in writing to create evidence that you resigned. When drafting the notice, refer to the original power of attorney by the date it took effect, explicitly state you are resigning and name the last day you will act as an agent.
Notarize the resignation notice. Some states require resignations to be notarized. If your state does not require this, you may still want to consider it because a notary provides additional evidence of your resignation and when it was completed.
Submit the written notice to the principal, keeping a copy for yourself. If the principal is incapacitated, some states allow you to submit the notice to the person’s conservator or caregiver.
Notify all parties you worked with on the principal's behalf -- such as banks and utility companies -- that you are no longer his agent. This is to ensure they do not expect you to take future action on the principal’s behalf. This also helps protects you from future conflicts regarding the principal.