A California man accused of posting an online advertisement authorities say led to the brutal rape of a Casper woman had a history of posting similar ads on the Internet, according to court documents.

Investigators say Jebidiah James Stipe posted an ad on Craigslist on Dec. 5 that read, "Need a real aggressive man with no concerns for women well being interested let me know."

Prosecutors say Ty Oliver McDowell responded to the posting and Stipe -- pretending to be his ex-girlfriend -- asked him to carry out a rape fantasy. The request asked for the act to include "humiliation, physical abuse [and] sexual abuse," according to previous courtroom testimony.

McDowell, 26, is accused of raping the woman less than a week later inside her Casper home. The Bar Nunn man was arrested on Dec. 17 and faces three counts of first-degree sexual assault.

During a preliminary hearing in December, McDowell's attorney suggested that his client is accused of raping a woman he thought wanted to play out a lurid sexual fantasy.

Stipe was arrested on Dec. 16 in Twentynine Palms, Calif., where he was living. The 27-year-old Marine and Carbon County native faces five felony charges, including conspiracy to commit first-degree sexual assault.

Both men face life in prison if convicted.

During their probe of the case, investigators with the Natrona County Sheriff's Office learned that Stipe's ex-wife reported to Washington authorities last summer that he had posted similar online ads with her as the target, according to court documents made public Thursday.

The woman told Washington detectives Stipe had "created false online accounts on ... Craigslist attempting to solicit people to rape her," the affidavit states. The document doesn't disclose where she lived.

Craigslist is a popular, San Francisco-based Internet site that allows users to post classified ads online at little or no charge.

During an interview with investigators, Stipe said he tried to arrange his ex-wife's rape because "he was angry" with her, according to the affidavit.

He created an e-mail account in her name, he said, because "individuals in his original effort to victimize [his ex-wife] had noted that he had a male handle on his email address and questioned the authenticity of the post," the affidavit states.

It was that false e-mail address Stipe included in the Dec. 5 Craigslist ad, authorities say. Investigators determined that he paid for the ad to be placed in the "Casual Encounters" section of the Internet site, according to the affidavit.

Stipe told investigators that after he posted the request, numerous people contacted him, according to the affidavit. Authorities say they later determined McDowell to be one of those people.

During subsequent online communications, Stipe sent McDowell a picture of his ex-girlfriend, as well as her home address in Casper, according to the affidavit.

The victim -- who had brief romantic relationships with Stipe during the summer 2008 and early 2009 -- told authorities she sent the picture to Stipe's cell phone in May.

Investigators say McDowell violently raped the 25-year-old woman inside her home just off Robertson Road on the morning of Dec. 11. He is accused of forcing his way into the home, tying the woman's hands behind her back, blindfolding her and attempting to gag her. Throughout the alleged rape, McDowell held a knife to the woman's throat and, in response to her pleas, repeatedly told her to "shut up," according to the courtroom testimony of Investigator Michael Steinberg.

Before forcing himself on the woman -- whom he outweighed by roughly 85 pounds -- McDowell allegedly said, "You want an aggressive man, b****? I'll show you aggressive," according to authorities.

Authorities say the woman was raped with a knife sharpener and penis.

The Star-Tribune does not identify alleged sex crime victims.

McDowell told authorities that after leaving the woman's home, he contacted the e-mail address from the Craigslist ad and was asked "to describe in precise detail the specifics of the attack," according to the affidavit.

Authorities say it was Stipe who requested the details of the attack.

Stipe told investigators he was upset with his ex-girlfriend for her "remaining in a relationship with her current boyfriend," according to the affidavit.

Stipe and the woman communicated via Myspace -- an online social networking tool -- up to a month before her alleged rape, according to posts on their personal pages online. In one of the posts, Stipe asked the woman about her current boyfriend.

Both Myspace accounts have since been deleted.

According to a public affairs officer with the U.S. Marine Corps, Stipe, a maintenance mechanic, enlisted in the armed forces in 2001. However, he was being processed for administrative separation as a result of a pattern of misconduct at the time of his December arrest.

He remains in the Natrona County Detention Center on $500,000 bond.

McDowell, who in a previous courtroom appearance said he was employed in the radiology department at the Wyoming Medical Center, also remains in custody on $250,000 bond. He is scheduled for an arraignment in District Court on Tuesday.

Court documents also reveal that on the day of the alleged rape, another man was seen leaving the alleged victim's residence at about 1:30 p.m. The man -- who was not arrested -- told investigators he went to the home after having communicated via e-mail with someone.

"Those email conversations consisted of requests [for the man] to enter the residence and perform a 'rape fantasy' on an unknown female," the affidavit states. "[He] was also to photograph the assault on the unknown female."

The e-mail address the man said he communicated with was the same one McDowell allegedly communicated with, authorities say.

Reach crime reporter William Browning at (307) 266-0534 or at william.browning@trib.com.

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