Help for Seniors (help4srs.org) is a Southern California-based organization. They published a list back in 2010 of 42 things to do when a loved one dies.
The organization recently published a specialized list of 46 things to do when your spouse dies. See:
When Your Spouse Dies
Help for Seniors
The second page of the document includes a list of documents and information you’ll need.
We have posted three other lists.