Sample letters for appointing an executor of a will are available on MoneyCrashers.com and HowToWriteALetter.com. Most of the samples on these sites are for more general letters of direction that include a section on executors alongside other essential elements of estate planning.
According to Rocket Lawyer, an executor letter is a document in which an executor of a will is officially appointed. The executor is responsible for making sure a deceased person's will is carried out in accordance with his wishes. Executor letters are usually issued in the presence of an estate lawyer who ensure that everything is correct and all parties mentioned in the letter agree to the terms.