Northampton , Massachusetts -LRB- CNN -RRB- -- Three teens accused in the bullying of a Massachusetts high school student who committed suicide pleaded not guilty to related charges Tuesday . Sean Mulveyhill , 17 , Kayla Narey , 17 , and Austin Renaud , 18 , were not present at Hampshire Superior Court . They entered their pleas through their lawyers . Judge Judd Carhart upheld an agreement between prosecutors and defense attorneys that the defendants report to State Police barracks for booking before Friday . They must also stay away from the family of Phoebe Prince , the dead student . Terrence Dunphy , attorney for Renaud , did not comment on the status of his client , but told reporters that Renaud is innocent . The body of 15-year-old Phoebe was found hanging in the stairway leading to her family 's second-floor apartment in South Hadley on January 14 , Northwestern District Attorney Elizabeth D. Scheibel told reporters last month . Phoebe underwent what Scheibel described as a months-long campaign of bullying that led to her commit suicide . The girl was on the receiving end of `` verbally assaultive behavior and threats of physical harm ... on school grounds , by several South Hadley High School students , '' Scheibel said . In the indictments , returned last month , the Hampshire County grand jury charged Mulveyhill , of South Hadley , with statutory rape , violation of civil rights with resulting bodily injury , criminal harassment and disturbance of a school assembly . The indictments charged Renaud , of Springfield , with statutory rape . Kayla Narey , of South Hadley , was charged with violation of civil rights with resulting bodily injury , criminal harassment and disturbance of a school assembly . Charges against another three girls included violation of civil rights with resulting bodily injury ; two also were charged with stalking . South Hadley Public Schools Superintendent Gus Sayer defended school administrators ' handling of the matter , saying Phoebe had not alerted anyone to her situation . `` She did n't reveal to people what she was being subjected to and , unfortunately , until January 7 we were not aware of what she was being subjected to , so -LSB- there was -RSB- very little way we could have intervened in the bullying , '' he said . Sayer cited two incidents that occurred on January 7 , a week before Phoebe 's death . In one , a girl walked into a classroom and called Phoebe `` an Irish slut , '' he said . The name caller was taken to the principal 's office and disciplined , he said . In the other , a girl `` said something threatening about Phoebe '' to another girl , he said . A staff member overheard the comment and reported it to the principal , who took disciplinary action , Sayer said . He said it was school policy not to specify what disciplinary actions may have been taken against any individual student , though he said the latter case did not include expulsion and that the student returned to school . `` To our knowledge the action taken was effective in ending their involvement in any bullying of Phoebe , '' he said . Phoebe , who had recently moved to the area with her family from Ireland , also was harassed as she walked through the halls of the school on the day of her death and as she walked on the street toward her home , Scheibel said . The harassment that day , by one male and two females , `` appears to have been motivated by the group 's displeasure with Phoebe 's brief dating relationship with a male student that had ended six weeks earlier , '' she said . None of the six students identified in the indictment remains in school , Sayer said . CNN 's Brian Vitagliano contributed to this report .