I lucked out with my suegra in a number of ways. She was one of the sweetest women I've ever met, and cultured and worldly to boot. And when it came time for her to meet her maker she went quickly and quietly. She even donated her body to Science. I still have what's left (cremains) in the basement somewhere. Ewwww.
The best part was we moved her here a year and a half before, and she really enjoyed being in the midwest and being near us. She had a genuinely good time, and Mrs. S. got to spend a lot of time with her. When all was said and done we had few regrets, which was nice. It is never easy loosing a loved one, but if you can manage to leave nothing unsaid or undone, it helps.
The SO will feel the loss for some time to come.