bassicly, can you marry someone, get sick of her, kill her, find someone else, and marry again?

Cuz thats how i roll

anyone?

No not without console commands to reset the quest.

This has been asked many times. From what others have said you can not. Too bad really. It sort of ties in with how it was said at one time if a shopkeeper was killed a family member would take over. This apparently doesn't happen either.