Nevada psychologist accused of killing wife reaches plea agreement
This guy took an "Alford Plea" in Nevada. Three to ten year sentence.
The difference is that the linked Alford Plea is domestic : people that know each other. The suspect in Naomi's abduction did not know her. She did not know him.
If Alford Plea is accepted in Nevada, then I think the suspect will ride it out until the deal is information about the body location in exchange for reduced sentence.