(Oregon City, WA)  --  An Oregon City woman is now facing a murder charge in the death of an infant she was watching.  Sarah Elizabeth Martin was arrested last month on a manslaughter charge in the death of seven-month-old Izaak Gillen.  Martin has since been indicted by a Clackamas County jury on a charge of murder.  Izaak died on April 7th, and physicians say he suffered a skull fracture apparently associated with violent shaking.