In the depths of the chamber of secrets, a panicked second year had a conversation with a thousand year old hat that nobody will ever know about while the pubescent shade of a Dark Lord monologued in the background.
The results of this were two fold.
Firstly, the hat coughed up the legendary sword of Gryffindor, regrettably point first. Secondly, the speckled git cowering underneath the hat and regrettably positioned under the point of a legendary sword died horrifically.
Any other things that happened as a result of his death were only tangentially related to the conversation.
A red-haired first year was drained of life, while her parasitic bossum buddy came into full life. Her brother (closest in age) died soon after, along with his confused charlaten of a defence teacher. Said parasite went on to take over the whole of 3/5ths of Wizarding Britain before he got into a dramatic death match with another aspect of himself and lost.
36 wizarding families perished to the last in the campaign. In the panic over the devestating loss of so manu good old families the Wizarding World was taken over by a coalition of Witches and sentient magical beings, which honestly made everything much better, and they all lived happily ever after.