The parents of a 4-year-old Washington girl, who allegedly died last week from overdosing on rainbow fentanyl pills, have been arrested in connection with her death.

Joseph Edward Walker, 30, and Judy Bribiescas, 39, were charged with first-degree manslaughter in the death of their daughter, who was found overdosed in a motel room in Kennewick, Washington, reports CBS affiliate KEPR, citing court documents .