(Vancouver, WA) -- A brother is charged with fatally stabbing his sister in their Vancouver home. The Clark County Sheriff's Office was asked to check on 36-year-old Diane Robinson, who hadn't been heard from in several days. A deputy contacted her brother, 34-year-old Dwayne Robinson, who also lives at the home. He told the deputy he stabbed his sister. Robinson was taken into custody and deputies found a deceased woman in the home. The Medical Examiner will determine her identity. Dwyane Robinson is charged with Murder in the First Degree.