Jessica Ridgeway Update: Arraignment delayed for Austin Sigg, suspect in Colo. girl's murder

(CBS/AP) GOLDEN, Colo. - The arraignment of Austin Sigg, a Colorado teen charged in the grisly slaying and dismemberment of a 10-year-old girl, was postponed Tuesday after his lawyers said they still had massive amounts of evidence to study.

PICTURES: Body of 10-year-old Colo. girl found

Judge Steven Munsinger continued the hearing of 18-year-old Austin Sigg until April 12.

Police have said Sigg previously confessed to killing Jessica Ridgeway, telling investigators he knew what he did was wrong and wanted to give the victim's family some level of comfort.

However, one of Sigg's attorneys, Katherine Spengler, said Tuesday the defense needed to thoroughly analyze all possible defenses, including Sigg's mental state at the time of the crime.

"A race to justice really is no justice at all," she said.

Sigg cannot face the death penalty because he was 17 at the time of the slaying. If convicted, he could face life in prison with the possibility of parole after 40 years.

Ridgeway, who lived in the Denver suburb of Westminster, disappeared while walking to school on Oct. 5. She left her house to meet a friend just two blocks away so they could walk to school together. Her torso was discovered in a field in the nearby suburb of Arvada, while other remains were found at the home of Sigg's mother after she called police.

At a Feb. 23 preliminary hearing, investigators presented 911 recordings in which Sigg told police, "I murdered Jessica Ridgeway. I have proof that I did it."

Westminster police officer Albert Stutson testified that Sigg told him during questioning that he planned to plead guilty. He asked officials if it would give Jessica's family comfort if he were held accountable. Stutson said Sigg told him "he knew what he did was wrong and that he would make up for it someday."

Sigg also faces an attempted kidnapping charge for the attack on a 22-year-old woman who was running at a lake across the street from Jessica's elementary school.

Complete coverage of Jessica Ridgeway on Crimesider