Ned Diamond at the end of Forgotten Lady definitely is relieved that Grace isnt going to jail. And realistically neither is he for very long if at all. I wonder if he ever sees the inside of a jail.
Knowing Columbo, he might find some way or other to not arrest him in the first place. It wouldn't exactly hurt his pride, since he knows Diamond is innocent, and since he knows the whole thing will fall apart anyway.
You wouldn't call it RELIEF in his case, but Mark Halperin gives a resigned look and just nods slightly, which kind of surprises me.