(Vancouver, WA)  --  The Clark County Medical Examiner confirms the death of a toddler earlier this year in Vancouver was caused by fentanyl.  Ruth Richards died March 25th.  She was 21-months-old.  The child's mother, Katherine Richards, has been charged with manslaughter.  Court records show, Richards found the girl dead in a crib.  Officers say they found drug paraphernalia and crystal meth in the basement of the home.  Richards pleaded not guilty in court last week.