( CNN ) -- Jessica Ridgeway 's suspected killer is a 17-year-old neighbor who authorities plan to try as an adult , officials in Colorado said Wednesday . Formal charges against Austin Reed Sigg , a high school student who lived about one mile from the 10-year-old and her family , likely will be filed Monday , Jefferson County District Attorney Pam Russell said . As a general policy , CNN does not show the booking photo or name suspects who are juveniles , but in this case , police had mentioned Sigg 's name and released his photograph in hopes the public could provide information related to the case . Sigg will face murder and kidnapping charges in death of Ridgeway , who was found a few days after she disappeared on her way to school on October 5 . Her body -- which was `` not intact , '' according to police -- was found at a park in Arvada , a Denver suburb just five miles from the family 's home in Westminster . `` We hope and pray that this arrest gives them some measure of closure in dealing with this horrible loss and tragedy they have suffered , '' Westminster Police Chief Lee Birk told reporters . Ridgeway 's family was told Wednesday morning that an arrest was made , police said . One of her great-grandmothers said she feels like she wants to set the suspect on fire . `` I do n't think I can look at this person , into his face and not be judgmental , '' Donna Moss told reporters outside her home in Independence , Missouri . `` I think what I have , it 's all I 've got within me to not want to just burn him . And I mean burn him . '' A warrant was served Wednesday at Sigg 's home . He will have his first court appearance at 8 a.m. Thursday . Police said a tip led them to Sigg 's home , police said in a news release . That visit allowed police to make an arrest in the Ridgeway case , as well as another case -- an attempted abduction near Ketner Lake . Sigg also will be charged with attempted kidnapping and attempted murder charges , the district attorney said . CNN 's Carma Hassan and Jason Hanna contributed to this report .
Formal charges against Austin Reed Sigg , 17 , expected to be filed Monday . Jessica Ridgeway , 10 , disappeared on her way to school on October 5 . The bodies of two women were found in a shallow grave near the Texas State Penitentiary at Huntsville last week.