A couple in Washington state have pleaded not guilty to charges that they streamed their sexual abuse of a 4-year-old girl over the Internet.

Brian K. Beston, 39, and his estranged wife, Hollie Beston, entered their pleas Tuesday in King County Superior Court.

Charging papers say the two were caught when a California child molester who had watched Brian Beston rape the girl over the Internet came forward to tell authorities about it as part of his therapy. Charging papers say Brian Beston admitted repeatedly raping the girl, and that Hollie Beston admitted taking photos and videos of it.

According to investigators, Beston was offering the girl online to have sex with the man and staged the live abuse to prove the authenticity of the offer.