The ritual to create the Horcrux would have been performed at some point fairly soon after the murder of Jorkins.
Timeline Notes
Jorkins had been missing for "over a month" on August 25, so she would have been murdered in mid-July. Voldemort would have performed the ritual to create the Nagini Horcrux fairy soon after that event.
Voldemort’s murder of Bertha Jorkins allows him to create a Horcrux using Nagini
Date July, 1994
Certainty Inferred from canon
Type of Event Wizarding world
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