William Pritchard, 23, has been charged with cyberstalking with sexual motivation by the King County Prosecutor’s Office. He is in custody and additional charges in are expected.

Detectives and prosecutors believe there may be other victims, perhaps many, in several other counties. Officials are asking anyone with information to come.

The investigation has led to a recommendation to the prosecutor’s office of 269 counts of cyberstalking, communicating with a minor for immoral purposes, harassment and extortion.

Detectives believe Pritchard cultivated a relationship with a 17 year-old girl on MySpace. Pritchard eventually began demanding nude photos of the girl via e-mail, and made explicit threats to the girl and her family if the photos were not sent.

As part of this harassment the girl received approximately 30 nude photos of Pritchard, along with sexually explicit comments.

Pritchard was able to get the girl’s home town and cell phone number from her MySpace page and left threatening messages on her voice mail and when she answered the phone. These threats went on for several months until the sheriff’s office became involved.

Pritchard said he would get his friends to kill her and her family; that he would kill her and carve his name into her chest; and that if she called the police he would kill her.

The calls totaled 269 from the period of late December in 2009 until the middle of March, 2010.

The suspect has already been charged with harassment in Pierce County and that trial is pending.

Pritchard has 2008 felony convictions for cyberstalking. He also has arrest warrants outstanding for cyberstalking and harassment from Seattle and Pierce County, respectively.

Based on a review of cell phone records received pursuant to a search warrant in the case, detectives believe there may other victims living in Pierce, Thurston, Snohomish, and King counties.

If anyone has been getting harassing or obscene phone calls from Pritchard, they are asked to call the King County Sheriff’s Office at 206-296-3311 (24 hours) or their local police department.