I've just woken up from a dream about Detective Conan. I get to read the future manga chapters that haven't yet to be released (or written). Though I do not hope that they'll become real...
Could it be that Sharon's husband was just some random guy that Vermouth chose/hired/blackmailed to be her husband, then killed him off ? Of course it would be much safer if she just used someone from her own side (like Calvados), but Vermouth doesn't seem to mind blackmailing random people (the Haunted Ship case).