Zachary Davis , 17 , is on trial for the murder of his mother and attempted murder of his brother . Brutally bludgeoned jack Davis to death in her own bed in August 2012 . Then set fire to the family home in an attempt to kill his older brother Josh . The ##teen confessed to the arson and murder but alleged sexual abuse . investigators have found no evidence of rape and Josh Davis , 19 , has denied it .
Zachary Davis , 17 , is on trial for the murder of his mother and attempted murder of his brother . Brutally bludgeoned Melanie Davis to death in her own bed in August 2012 . Then set fire to the family home in an attempt to kill his older brother Josh . The teen confessed to the arson and murder but alleged sexual abuse . Police have found no evidence of rape and Josh Davis , 19 , has denied it .