The 29-year-old met his ex-girlfriend online, and in federal court Wednesday afternoon, he admitted he used the Web to threaten and harass her when the relationship went sour.

Shawn Memarian left the courthouse without wanting to comment Wednesday afternoon. Memarian was free on bond after admitting to a judge that he is guilty of what the the government calls cyberstalking. Memarian told the judge he dated a Gladstone, Mo., woman named Melissa Standfort for a couple of months during 2006. He said after the relationship ended, he suspected her of keying his car so he started e-mailing her. According to court documents, Memarian threatened her with death, even sending her e-mails claiming that she would be dealt with by a member of an organized crime family.

Then, according to court documents, he posted personal false ads on MySpace, and Craigslist giving Standfort's personal information, including her address, inviting readers to her house for sexual gratification. The victim had about 30 unknown men show up at her house in response to the e-mail and ads. Many of the visits were at night when she was at home alone.Standfort called police.

In court Wednesday, Memarian told the judge he knew what he did was wrong and he was sorry for the stress he caused his ex-girlfriend. Memarian will be sentenced in a few months. He could receive up to five years in prison.