Nina Foch Then
Nina Foch gained a lot of notoriety during her time on NCIS, when she appeared a couple of times as Victoria Mallard, Ducky Mallard’s mother. She made a big impression on viewers but then it was explained that Victoria had developed Alzheimer’s disease. Of course, Ducky was very private about the situation and actually hid the fact that she died from everyone until Abby found out.