A Los Angeles federal jury is to deliberate the case of Lori Drew, the mother from Missouri accused of harassing one of her daughter’s “friends,” 13-year-old Megan Meier, over the internet, driving her to commit suicide.

"Lori Drew decided to humiliate a child," U.S. Attorney Thomas O'Brien said. "The only way she could harm this pretty little girl was with a computer. She chose to use a computer to hurt a little girl, and for four weeks she enjoyed it."

Drew, who is 49, seemed unfazed by the argument. Her lawyer, Dean Steward, replied that jurors must remember that she isn’t tried for the homicide of Megan Meier, who hanged herself after a message from the Drew’s assumed identity of ‘Josh Evans’ told her online that the world would be a better place without her.

''If you hadn't heard the indictment read to you, you'd think this was a homicide case,'' Steward said. ''And it's not a homicide case. This, ladies and gentlemen, is a computer case, and that's what you need to decide.''

He insisted that the only question relevant is if whether Drew violated MySpace’s terms-of-service agreement, a seven-page agreement which he said that Drew, her daughter Sarah and assistant Ashley Grills (all involved in Megan’s harassment) never read.

''Nobody reads these things, nobody,'' he said. ''... How can you violate something when you haven't even read it? End of case. The case is over.''

Drew entered a plea of not guilty to the charge – conspiracy and accessing computers without authorization – which could lander up to 20 years in prison if convicted on all counts.

Assistant U.S. Attorney Mark Krause said in his closing arguments that Drew was responsible for creating an imaginary teenage, Evans, an attractive new kid in town who would chat online with Megan and get her to reveal if she was spreading rumors about Sarah. She and Megan used to be best friends but had a falling out.

Krause presented the picture from the fake Evans account, showing a teenager with a bare chest and tousled brown hair.

Krause said Drew instructed her daughter and her (then) 18-year-old assistant to flirt with Megan, under the guise of Evans. By doing so, she violated MySpace rules.

''The rules are fairly simple,'' he said. ''You don't lie. You don't pretend to be someone else. You don't use the site to harass others. They harassed Megan Meier.''

Krause went on to point out that Drew was warned that her actions were wrong, including Grills herself who told her it may be illegal.

"She knew she was violating the rules and yet she told these two kids to keep doing it," he said.

The prosecutors referred to testimony that Megan was suffering from and being tread for depression, and Sarah herself testified that she knew about Megan taking medication and seeing a psychiatrist.

''The defendant knew that she was dealing with a troubled little girl who was extremely fragile, and yet she did it anyway,'' Krause said. ''It went beyond a simple prank,'' he went on, ''to get her so hooked on this young man that she would be crushed when she found out he didn't exist.''

Steward argued that Drew did not write most of the messages and was actually away from home the day of the last message, the one sent right before Megan killed herself. He also argued that the message quoted throughout the trial was not to be found on MySpace but actually had been sent through AOL.

Steward also attacked Grills’ credibility due to her testifying under a grant of immunity.

Finally, he blamed Tina Meier, Megan’s mother, for allowing the conversation with Josh Evans to continue after she learned of it, and not watching her closely enough.

The jury is set to begin deliberations on Tuesday.