Yes - my understanding is she was the wife of a spoon and didn't have diplomatic immunity? I agree perhaps there is more to it, but still it leaves a bad taste in the mouth.
Clearly, the parent comment's interpretation is correct in this context. The only other use I've encountered was #3, I believe in James Ellroy novels.
At least the US State Dept position is that she did have diplomatic immunity.
With more civilized countries, the idea is that the person accused is still being tried, but in its country court, with the assumption that if they are guilty, they will get sentenced anyways.