My apologies in writing this last minute resignation letter; however, due to unforeseen circumstances, I must resign from my position as Sales Director with Company Name effective one week from today, Friday, September 26, 2014. I am truly sorry for any inconvenience this may cause for any of my colleagues and hope that you can understand that my current situation will not allow me to give additional notice of my resignation.
I have every intention of performing up to my expected level of dedicated expertise during this last week of employment with Company Name. You can count on me to complete any projects I currently have in the works, and if there is time, I am more than willing to assist in the training of my replacement. Please do not hesitate to reach out by phone at 000-000-0000 or by email at email@example.com should you need any additional information.
I have absolutely enjoyed my employment as Sales Director here at Company Name and am grateful for the experiences I have gained. I wish the staff well and great future success, and I thank you for your consideration in this matter.