How do you write a termination letter letter to your atty?

Using a standard business letter format (link below), state the problem and any specifications as your first paragraph, 'I am writing to advise you..., (and to request... if necessary)'.

Use the second paragraph to explain the action and the reason(s), keeping it short and to the point. Mention or list anything that may be attached to support your action.

Start the third paragraph with any important dates or time frame, if applicable; next provide the information necessary for them to contact you; and the last sentence is used to thank them for their time and/or their acting on your request. (Yes, thank them even if you are terminating the attorney for a contentious reason, always be professional.)