5 Tips on How to Write a Condolence Letter. When you start the letter, you want to mention the name of the deceased and acknowledge their passing.Acknowledge the loss, and if possible, share a positive memory or anecdote about the deceased. Acknowledge the loss and offer your sympathy. Keep the letter as brief and as short as possible. "I'm very saddened to hear of your loss. " "I am so sorry for your loss. My heartfelt condolences go out to you and your family. No words can describe how sorry I am for your loss.