the class pet had died

sundy the pet of the class of 3rd of ESO C had died the 25th of february of 2010, sundy died during the brake between the the classes of maths and english. The people of the class are very sad because of this traumatic act, they are sure that it was a murder and they thougth that the person wich is responsible of this murder is from another class . it is a mistery because i think that the people inside the class are the ones responsible of this death of this poor animal when they pretend to play with sundy. i thikn too that they were practicing a type of budu