Oops, I got the wrong title. Of course it's "Double Exposure" as in the list, but still the bit about his wife stands.

That's a great observation, RoyalFool! And it would be interesting to know whether there are other examples. Now, I can't exactly remember if Joe Devlin in "Conspirators" was ever implied to have a wife back in Ireland, but it seems like it could have been hinted at. (On the other hand I could be completely wrong; it's been awhile since I saw that episode, even though I like it quite a bit.)