(Seattle, WA)  --  A Spokane woman is facing a murder charge in the death of her 15-month-old son at a Redmond, Washington-area home.  Bail is set at one-million-dollars for Tami Christianson, who remains in the King County Jail.  She's accused of strangling the boy at her parents' home last Saturday.  Authorities say Christianson has a history of mental illness and had threatened to kill the baby when he was two-months-old.