how did marley die in the christmas carol

Marley's death is not explicitly explained in Charles Dickens' A Christmas Carol. However, there are several references to his death throughout the story, suggesting that he died of natural causes. For example, Scrooge tells the Ghost of Christmas Present that Marley "was dead as a door-nail." Additionally, the Ghost of Christmas Past shows Scrooge a vision of Marley's funeral, where he is described as "an undistinguished corpse." These references suggest that Marley's death was not due to anything unusual or supernatural, but rather a natural occurrence.