Question: how nagini became a horcrux?
Answer: Nagini was the final Horcrux 'There will come a time when Lord Voldemort will seem to fear for the life of his snake. ' Nagini was not only the last Horcrux to be killed, but also the last Horcrux to be created. In an interview, J.K. Rowling revealed that it was the murder of Bertha Jorkins that made Nagini a Horcrux.