According to the search results, Bathilda Bagshot was murdered through the use of Dark Arts. Her body was then animated by Lord Voldemort using his snake, Nagini, and left as a trap for Harry Potter and Hermione Granger when they visited Godrics Hollow as part of their mission to destroy the Horcruxes. It is not clear who exactly killed Bathilda Bagshot, but it is assumed that Voldemort was responsible for her death.