Sue Huffer found this post on the Ancestry blog and thought you might find it helpful. It has to do with using a will to determine a death date when no other evidence is available. The gist is:
When you’re looking at wills, look for those two dates: the date the will was written and the date it was admitted into probate. With those two dates, you’ll have narrowed down when the person died.
The full post is ‘How to Estimate a Date of Death With a Will‘ by Amy Johnson Crow.