I was thinking more like a chain of very cunning events (Final Destination style) so it could never be linked back to me.
I don't think you can setup a rediculous final destination death event in skyrim but there's many ways not to get your hands dirty. As someone said, leave her near a dragon or take her to go see boethiah.
I wonder if you tell her to wait somewhere will she stay there permanently or will she eventually return home?
You know you can't remarry right? Your vows are for eternity not til death do us part...she'll be waiting in sovngard for you
