A man has pleaded guilty in Washington state to raping his 7-year-old adopted daughter from China.

Police say the sexual abuse occurred over a four-year period.

Fifty-one-year-old Eddy Tony Whisenhunt faces more than 18 years in prison when he is sentenced next month in Thurston County Superior Court after pleading guilty Thursday to three counts of first-degree child rape.

The Olympian reports Whisenhunt's wife, Donna Marie, also faces child-rape charges.

Court papers say the abuse was discovered by a school counselor. The child was placed in the custody of Child Protective Services after the couple's arrest in May.