This Condition located on the Personal category tab in Search Builder allows you to find people who have been widowed based on the date their spouse died. This is a calculated date that you will not see on a person’s record. It coincides with the deceased date for their spouse.
You might wan to run this Condition near the end of the year using a Comparision of Greater Than or Equal to Jan 1 of the current year. That will find everyone whose spouse has died during the last year. You can use this list to reach out to these people during the holidays, either with a card, a phone call, or an invitation to an event geared toward widows and widowers.