What happened to Lady Macbeth in Act 5?

Lady Macbeth dies in Act 5 of Shakespeare's play Macbeth. Her death is reported by a messenger to Macbeth in Scene 5. The details of her death are not explicitly described in the play, but it is clear that she has killed herself. Macbeth says, "She should have died hereafter; / There would have been a time for such a word" - implying that he wished she had lived a little longer so he could find comfort in her company instead of being left to face his despair alone.