The other...*

Garvin reported his wife "disappeared" while vacationing in Key West. In reality she didn't arrive with him to Key west at all.

Florida Investigators, use Finger prints, dog search, credit card reviews, restaurant employees interviews, hotel cameras, toll both, telephone communications, computers search, and a GPS monitor on his car. 

They tracked him to his wife's body.  Garvin agreed to a life sentence.

With the death of his wife, he is in prison, and his other woman is no longer.

There is no perfect crime.  Only ignorant persons think they can do that.   Just a thought.