The Daily Courier reports 50-year-old Cynthia Mueller's husband David had been suffering from a degenerative neuromuscular disease when prosecutors say she became frustrated and killed him with the help of Charles Todd.
The Nevada man testified he was having an affair with Mueller. Todd pleaded guilty to his part in the crime in a deal that carries a sentence of at least 15 years.
Mueller was convicted on all charges including first-degree murder, which carries the mandatory life sentence without parole.
Defense attorney Greg Clark declined to comment, but argued in court that Todd committed the murder to be with Mueller.
She's scheduled to be sentenced Aug. 19.
Information from: The Daily Courier, http://www.dcourier.com
Copyright 2015 The Associated Press. All rights reserved. This material may not be published, broadcast, rewritten or redistributed.