Luis Gomez-Monges and Adriana Mendez are charged with 1st degree attempted murder and assault.
They are accused of beating Vernon Holbrook and slashing his throat.
Mendez told police she and Gomez-Monges made up names and set up a home tour specifically with the 78-year-old.
Holbrook was transferred from a Seattle hospital over the weekend to another medical facility for further treatment.
A trial date is set for July.