Hundreds of people helped search for her. Jessica's backpack was found two days later in Superior, a town about 6 miles from her home. Days after that, human remains later identified as Jessica's were found in a park.
Authorities, meanwhile, urged residents to watch for any suspicious changes in neighbors' behavior. Officers guarded crosswalks and photographed cars in the area. Parents escorted their children to and from area schools. Mailboxes and trees were encircled by ribbons in purple.
On Oct. 19, 2012, a resident contacted authorities to alert them to Sigg because he reportedly had a fascination with death, Westminster police Detective Luis Lopez testified at a preliminary hearing. FBI agents took a DNA sample from Sigg.
On Oct. 23, Sigg's mother, Mindy Sigg, called 911, saying her son wanted to confess.
Investigators said Sigg told them some of Jessica's remains were hidden in a crawl space in his mother's home, where he lived. He also allegedly told investigators that he dismembered Jessica in a bathtub.
Sigg dropped out of high school after the 11th grade and later earned a graduate equivalency diploma. Former classmates say he was intelligent, interested in mortuary science and was bullied for having a high voice.
When asked about his criminal record on the 911 call, Sigg told the dispatcher: "The only other thing that I have done was the Ketner Lake incident where the woman got attacked. That was me."
In the attack on the jogger, investigator Michael Lynch testified that Sigg used homemade chloroform to attempt to subdue the woman. She escaped.
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