( CNN ) -- A Florida man pleaded guilty Friday to kidnapping , molesting and murdering a 7-year-old girl more than two years ago , an admission that elicited anger , disbelief and contempt from the slain 's child 's relatives . As part of a plea deal reached with prosecutors , Jarred Harrell was sentenced to life in prison without the chance of parole , waiving his right to appeal , after pleading guilty to first-degree murder , kidnapping , sexual battery and lewd and lascivious molestation . He admitted in court that he made the agreement in order to avoid potentially facing a death penalty . `` You 're not even a human being , '' the victim 's sister said in court after Harrell 's plea . `` Your name is not Jarred Harrell . Your name is monster . '' She was one of several relatives of Somer Thompson who took the stand in the tear-filled courtroom Friday to give victim 's impact statements . Several of them noted that Harrell refused to look at them , including the slain girl 's twin brother . `` She trusted you , but you had to do what you did and look where it got you . And now you 're going to jail , '' yelled out the boy , now 9 , after trying to stare down his sister 's killer . Somer Thompson went missing in October 2009 in the Clay County town of Orange Park , Florida . Her sister , then 10 , told police that Thompson had been in a fight with another girl at school that day and had brought up the subject while she and her brother walked her home . Thompson ran off , apparently upset . The older sister said she lost sight of her in a group of other children leaving the school , according to a police report . Days later , Thompson 's body was found about 55 miles north of Orange Park in a landfill in Folkston , Georgia . In February 2010 , Harrell was arrested in Meridian , Mississippi , by federal agents following a search of his Florida residence , Clay County authorities said . He was charged with 29 counts of child pornography , and eventually was extradited to Florida . A few weeks later , on April 1 , 2010 , Harrell was indicted on the four additional counts -- first-degree murder , kidnapping , sexual battery and lewd and lascivious molestation -- related to the disappearance and death . In the indictment , prosecutors said Harrell , now 26 , killed the girl `` by asphyxiation with blunt force injuries . '' He also `` forcibly or by threat '' held the girl `` against her will and without lawful authority , '' the document states . Harrell initially pleaded not guilty to all the charges -- from the murder to the child pornography counts -- before changing his plea on the various counts on Friday . Succinctly answering questions posed by 4th Judicial Circuit Judge Don Lester , Harrell admitted to the facts of the crime , including taking video and pictures of Somer Thompson . Prosecutor Steve Nelson noted that there were `` numerous consultations '' with Somer 's relatives about the plea deal , and that several law enforcement agencies were included in the process . The slain girl 's mother , Diena Thompson , said she could n't bring herself to forgive what Harrell did to `` an innocent child . '' `` 835 days ago , you lured my baby into your lair with trickery and malice in your soul , '' the mother said , after following her son to the stand to give the final victim 's impact statement . `` All to commit unspeakable acts of your own selfish desires and flat-out evilness . '' Diena Thompson added that Harrell took her daughter 's dignity , virginity and then life , `` and after all that , you then treated my child like trash . '' `` It is now time to take out the trash , '' she said , referring to Harrell . `` May God have mercy on your sorry , sorry soul . ''
NEW : `` Your name is monster , '' a girl says of her sister 's killer . Jarred Harrell pleads guilty to murder , kidnapping and sexual battery . Somer Thompson was found in a Georgia landfill about 55 miles from where she was last seen . Her mother says of Harrell , `` May God have mercy on your sorry , sorry soul ''