COLORADO SPRINGS, Colo. -- The mother of a Fort Carson soldier accused of sexually assaulting and then slitting the throat of Fort Collins woman said her son should get the death penalty.

Robert Hull Marko, 21, is being held without bond on suspicion of first-degree murder and sexual assault with a deadly weapon in connection with the slaying of Judilianna "Judi" Lawrence, 19.

El Paso County Sheriff's Department investigators found Lawrence's naked body off Old Stage Road, west of Colorado Springs on Monday. A police affidavit said that investigators were led there by Marko, who admitted having "rough sex" with Lawrence and then cutting her throat as she stood next to a tree.

Lawrence's mother alerted authorities when her daughter didn't show up for class at a school for students with learning disabilities. The mother later had a sister check Lawrence's computer and found she had been conversing with someone on MySpace and the two were to meet in person last Friday.

Investigators checking the MySpace page of Rex290, saw photos of the man in Army fatigues and read the name MARKO on the uniform. That name led them to Fort Carson Army Base where they detained and questioned Robert Marko.

On the MySpace page, Marko writes, "I'm becoming a cold hearted killer and can kill without mercy or reason."

In a comment on Marko's MySpace page , Elizaberh Hull, from Claypool, Ind., warned the girls posting comments on the page that they should be aware of what her son is accused of:

"Open (your) eyes up. This could have been one of you. I am devastated by what my son has done and I will never know how her poor mother must be going through right now, but he has not only destroyed his (life) but he has destroyed her family and his own family. I believe with all of my heart even though I am his mother I will always love him, but he deserves the death penalty for what he has done."

She later removed the comments from his page but talked to KRDO television in Colorado by phone.

"He's got that blank dead stare in his eyes of no remorse and how he says he could do it again and do it with no mercy and no reason, that's very disturbing," she said.

She also repeated her statement that she believes her son deserves to die.

"I don't think sitting on death row or anything would do it, I think he really does need the death penalty," Hull told the station.

On a personal page on VampireFreaks.com, a person using Marko's e-mail address listed his dislikes as "family."

A fellow soldier from Fort Carson who said he served with Marko in Iraq also posted a comment on MySpace that Marko had a "huge imagination" and said that most of the things Marko said about Iraq never happened.

"Shawn" wrote: "We never had a hard time. We had guard (duty) and we went out on patrols … but as fire fights and death were to blame for this, it is fake. He never saw blood. He never saw action to shoot at."

"The Army had nothing to do with this except to give him a different place to live and I would bet this would of happened in Michigan, if he was there," the poster wrote.

That sentiment was echoed by a high school friend of Markos who talked to the Kalamazoo Gazette.

Kyle Haas, now 20, told the newspaper that she exchanged e-mails with Marko as recently as about a month ago.

Haas said that Marko sometimes called himself "Raptor Robert'' while in high school. "One time, he said he was going to kill everybody,'' she said.

“Our units deepest condolences go out to the family and friends of Judi Lawrence,” said Maj. T.G. Taylor, a spokesman for the 4th Brigade at Fort Carson.

When asked if Marko suffered from post traumatic stress disorder, Taylor told 7NEWS, “(The soldier) was identified to see a behavioral health specialist for reasons not related to deployment.”

“From what I’ve read, there’s no question this guy had some issues beforehand,” said Dr. Andrew Sweet, a licensed psychologist and adjunct professor at Metropolitan State College in Denver. “That may speak to the issue of whether our military are doing a good job of screening people before they enter them into basic training.”

Sweet said it is probably “just a bad set of coincidences,” that six people from the same Brigade are being linked to murders after returning from Iraq. “It’s very sad for the people involved, but I can’t see how anybody can make a case that it’s because they’re in this regiment.”

The psychologist said it’s not unusual to have a high incidence of crime when you have a concentration of young men.

“Most of us already know this, but most of our criminals are male, between the ages of 18 and 25," he said. "That’s the population that goes to prison. That’s the population that gets arrested, prosecuted and convicted.”

But Sweet added that when you compare similar size populations of men in that age group, military and non-military, the men not in the military are more likely to engage in criminal behavior.

“You’re safer going on a canoe trip with a bunch of veterans than you are going on a canoe trip with your average 18 to 25 year old in terms of statistical safety.”