Contact was made with Sigg during a 400-home search for the Westminster girl.
Hundreds took part in the search. They focused on the area between Highway 128 and Highway 93, including Eldorado Canyon in Boulder.
Sigg appeared in court Thursday morning. He is suspected of killing and dismembering Jessica.
9Wants To Know confirmed Wednesday partial remains were found at the house where the suspect was arrested.
According to FBI statistics, investigators often have contact with the killer before the person becomes the primary suspect.
(KUSA-TV © 2012 Multimedia Holdings Corporation)