NEW : Memphis ' police chief says the suspect carried ` ` a fight all night '' Eduardo Marmolejo told investigators his principal ` ` made him angry , '' police say . The head of Memphis Junior Academy was found lying in a pool of blood . Memphis Police Director Toney Armstrong told CNN on Thursday that the suspect `` has been carrying a grudge all summer long '' because the previous school year he 'd been switched out of a class that he liked . `` Basically , he conspired all summer as to how he was going to get revenge , '' Armstrong said . The teenager is released without bond after a juvenile court hearing , a probation official says .
NEW : Memphis ' police chief says the suspect carried ` ` a fight all night '' Eduardo Marmolejo told investigators his principal ` ` made him angry , '' police say . The head of Memphis Junior Academy was found lying in a pool of blood . The teenager is released without bond after a juvenile court hearing , a probation official says .