how did marley die in a christmas carol

Marley died of a heart attack brought on by his greed and avarice. In the original novel by Charles Dickens, Marley's ghost visits Scrooge on Christmas Eve and warns him that he too will suffer a similar fate if he does not change his ways. Dickens uses Marley's death as a cautionary tale about the dangers of greed and selfishness and the importance of kindness and generosity in the world.