While there are certainly many deaths in Wide Sargasso Sea (Antoinette's entire family, for example), neither Antoinette nor Rochester actually die. Instead, death for them becomes a potent metaphor for all of the ways in which selves can be lost, transformed, or destroyed. The novel plays on the literary tradition of equating death with orgasm in order to suggest how sex between the characters can be a form of control, rather than pleasure. The novel is also littered with people who act like zombies, beings that are both alive and dead, and ghosts, beings that are neither alive nor dead.
In Wide Sargasso Sea, zombies, or the living dead, are used to symbolize the different ways that characters can be physically alive but socially or emotionally dead at the same time.
Antoinette's dream of committing suicide at the end of Wide Sargasso Sea actually signifies her rejection of her racial prejudices and her ultimate identification with the black Caribbean community.