Warning: This story contains graphic content some may find disturbing.

SEATTLE -- A man and his ex-wife are accused of sexually abusing a 4-year-old girl and streaming the abuse live on the Internet.

Brian K. Beston, 36, of Kent, and Hollie Beston, 31, of Burien, have each been charged with first-degree child rape, first-degree child molestation, exploitation of a minor and dealing in depictions of a minor engaged in sexually-explicit conduct.

According to the statement of probable cause, the two abused the girl between June 2009 and Oct. 23, 2009, and sent child pornography to another accused child molester in San Diego whom they met online.

It was FBI agents investigating the San Diego suspect who brought the Bestons' case to the attention of Seattle police.

The Bestons allegedly met the California man on Craigslist where the man, posing as a single mother under the handle "jennymomsd," had posted an entry looking for other parents in both San Diego and Seattle, according to the document.

Brian Beston first came across jennymomsd, and introduced the person to Hollie Beston, investigators said, initiating a correspondence via e-mail and instant messenger between the three of them.

The couple began exchanging child porn with jennymomsd and soon the Internet contact "was accepted as a fellow child lover," the court documents said. Jennymomsd then requested pornographic images of children and began receiving pictures of a young girl, according to detectives.

Jennymomsd claimed to have a brother interested in having sex with children, prosecutors said, and the conversations eventually turned to talks of this brother visiting Seattle to have sex with the young girl featured in the photographs sent by the Bestons.

But Jennymomsd remained skeptical of the authenticity of the Bestons' photos; he thought the images may have been pulled from the Internet, he told investigators. When he expressed his skepticism to Brian Benson, the Kent man offered to present the girl via a live video feed, the statement said.

Brian Benson, using the camera on his computer, provided Jennymomsd with a live feed featuring himself sexually molesting the pictured girl for approximately five minutes, detectives said, even briefly holding up a sheet of paper with the day's date written on it to prove the authenticity of the feed.

Jennymomsd later confirmed to federal agents that the girl featured in the feed was the same girl who had appeared in the 40 to 50 pornographic images the Bestons had sent him throughout the course of their correspondence.

During another live feed session, jennymomsd watched Brian and Hollie Benson have sex, through which he got a clear view of the pair's faces, according to the statement. This information, along with a phone number Hollie Benson had provided jennymomsd, later helped investigators confirm the Bestons' identity.

After federal agents found the images of the girl on jennymomsd's seized computer, Seattle police detectives served search warrants at the homes of Brian and Hollie Benson, seizing computers, cameras, flash drives and cell phones. Investigators said the equipment had been used to record and distribute child pornography.

Brian Benson admitted to having abused the 4-year-old girl, as well as to having taken images and video footage of her and sending them over the Internet, the statement said. Benson told detectives he began abusing the girl in June 2009, and continued to do so once or twice a week until the beginning of October.

Hollie Benson told investigators she had knowledge of the alleged abuse, in which she took "an active role," the statement said. She admitted to having witnessed the abuse, and taking sexually-explicit photos of the girl.

Brian and Hollie Benson were arrested and booked into King County Jail. The two are scheduled to be arraigned on Nov. 10, and are each being held on $500,000 bail.

The alleged victim is in protective custody.