GOLDEN, Colo., April 14 (UPI) -- A Colorado teenager whose mother said had confessed he killed Jessica Ridgeway, 10, has pleaded not guilty to charges of killing and dismembering her.
Austin Sigg, 17, entered the not guilty plea Friday in Golden, Colo., after his lawyers' request for more time before they entered a plea was denied. They entered the not guilty plea and reserved the right to change the plea, The Denver Post reported.
Jessica was kidnapped Oct. 5 while on her way to school. Volunteers, neighbors and police searched the area and two workers in a field in Arvada found her body five days later.
An autopsy concluded she died of asphyxiation caused by suffocation or strangulation.
Sigg, who was arrested Oct. 23, and his mother both told police he killed Ridgeway.
"My son wants to turn himself in for the Jessica Ridgeway murder. He just confessed to killing her," Sigg's mother, Mindy, told a dispatcher in a call she made to police prior to his arrest.
A detective said at a Feb. 22 preliminary hearing Sigg told his mother, "I'm a monster."
Sigg is charged with 18 counts connected to Ridgeway's death and to a Memorial Day attack on a jogger.
Mandatory life sentences attach to four of the counts.
Sigg's trial was scheduled at Friday's hearing for Sept. 20.