Teen's death still a mystery after three months

CANTON, Ga. - Three months after the nude, partially burned body of 15-year-old Katie Hamlin was found in a dry creek bed, investigators say her death is still a mystery.<br> <br> Although one man has been charged with offenses related to her death, her father thinks the investigation is at a dead end.<br> <br> And while her mother says she is generally satisfied with the way the investigation has been going, she admits feeling very frustrated with the investigators&#39; inability to pin down how her daughter died or to charge anyone with her death.<br> <br> Katie&#39;s ashes were to be buried in Woodstock on Saturday, one day before her 16th birthday.<br> <br> Cherokee County Sheriff&#39;s investigators will say only that the case is still under investigation. County coroner Earl Darby said the autopsy is complete, but no cause of death has been determined.<br> <br> Katie was 5-9 and &#34;a solid 145&#34; pounds, said her mother, Donna Hamlin. She said she doesn&#39;t believe the person responsible for Katie&#39;s death acted alone.<br> <br> Jamerson Douglas Mangrum, 17, was arrested July 11, more than a week after Katie was found - one day after she had been reported missing.<br> <br> Initially charged with statutory rape, child molestation, making false statements to investigators and cruelty to a child, Mangrum&#39;s charges changed when he came up for a bond hearing to two counts of aggravated child molestation, one count of simple child molestation, abandoning a body, concealing a death and tampering with evidence.<br> <br> Mangrum is free on $50,000 bond, but is under house arrest, restricted to his home when he isn&#39;t in court, school or his lawyer&#39;s office.<br> <br> Katie&#39;s father, Joe Hamlin, said Mangrum &#34;holds the key on what happened to Katie.&#34;<br> <br> &#34;It appears she was alive while she was with him, and died while she was in his care,&#34; Hamlin said. &#34;I think he knows what happened to her, but he won&#39;t say. The latest charges brought against him lead me to think that he knows, but he&#39;s too scared to say.&#34;<br> <br> Katie&#39;s mother hopes that Mangrum&#39;s trial will be in the next couple of months.<br> <br> &#34;I hope that whenever we go to court, that somebody comes forward,&#34; she said.<br> <br> She looked to Saturday&#39;s memorial ceremony to bring some relief to her grief.<br> <br> &#34;This&#39;ll give me some peace,&#34; she said. &#34;But I don&#39;t think I&#39;ll have real peace until I know what happened.&#34;<br> <br>