You have decided to revoke a person that you have appointed as your Durable Power of Attorney, for any number of reasons. Can a person revoke a Durable Power of Attorney, if so, how?
As long as you are competent you revoke any person that you have appointed as Durable Power of Attorney. The revocation of the Durable Power of Attorney should be in writing, and it should be delivered to the person you appointed as Durable Power of Attorney and also to all third parties with whom the Durable Power of Attorney is dealing with (bank, insurance companies, etc.). A third party is entitled to rely on a Durable Power of Attorney which has been terminated or revoked until the third party has actual notice of the termination.
If because of your disability you are unable to revoke it, anyone interested in your matters can ask the probate court to step in and appoint a conservator to handle your matters. The conservator can direct the person acting as your Durable Power of Attorney to account and report, and can suspend or revoke their powers.
Please note, that the Durable Power of Attorney terminates at the time of your death, unless there is uncertainty as to whether you are dead or alive.