( CNN ) -- The man police say kidnapped and brutally murdered a 7-year-old Georgia girl pleaded guilty Tuesday and was sentenced to life in prison without the possibility of parole . Ryan Brunn entered the plea at a hearing in a Cherokee County courthouse , during which he described in detail how he enticed , molested and killed Jorelys Rivera . The girl 's mangled body was found in a trash compactor three days after she went missing on December 2 from an apartment complex in Canton , which is about 40 miles north of Atlanta . Brunn , 20 , who worked as a maintenance man at the same apartment complex , was arrested on December 7 and charged with the crime . He told the court he had never talked to Jorelys before the day of her murder . He said he devised a plan after he found one of her skates . Brunn took a picture of the skate and approached her with it , asking if the skate was hers . She said yes , and Brunn promised to take her to it . Instead , he took her to an empty apartment and instructed Jorelys to pull down her pants . He then put tape over her face and cut her throat with a razor . At this point , she was still alive , he told the court . So Brunn took Jorelys to the bathroom and beat her to death with the skate . He said he did not have sex with the girl . Next , Brunn put Jorelys ' body in a plastic bag and loaded it into his maintenance golf cart . He put the body in the trash compactor and operated the machine . He then went home and hung out with friends . Later , he again operated the compactor . Increasingly , Brunn told the court , he grew concerned about what he had done . So he took a receipt , wrote on the back of it , `` She is in the trash can , '' and taped it to the compactor . He admitted lying to investigators who had questioned him about the case . Brunn said he knew right from wrong . During his testimony , relatives of the slain girl were visibly upset , crying and shaking . `` I would like to apologize for everything I have done , '' Brunn told her family in court . Last week , he was indicted on 13 counts including murder , aggravated assault , cruelty to children , aggravated child molestation , enticing a child for indecent purposes , false imprisonment , abandonment of a dead body , making a false statement and sexual exploitation of children . According to the indictment , Jorelys was severely beaten and stabbed repeatedly in the face , neck and chest . Brunn 's attorney had said previously he planned to plead not guilty . Brunn had no known criminal history , authorities have said .
NEW : Ryan Brunn is sentenced to life in prison without parole . NEW : He describes how he enticed , molested and killed Jorelys Rivera . NEW : Brunn , 20 , says he cut her throat and beat her with a skate . New : His defense team argues that the murder was an accident caused by his addiction to drugs. He offers an apology to her family in court .