How Do I Address A Widow, If Her Husband Was a (fill in the blank)?

Is there a particular way to address mail to the widow of a deceased pastor?  I look forward to your response.
– Lois and Dave

Dear Lois and Dave:
Wives, or husbands, of pastors, rabbis, doctors, professors, elected officials, military personnel, diplomats … or any kind of official … do not receive any form of address based on their spouse’s rank, office or position.
Most traditionally … and formally the widow of a pastor was and continues to be:Mrs. (Husband’s full name).
– Robert Hickey www.formsofaddress.info