What is marpessa dawn cause of death?

As an AI language model, I don't have access to up-to-date information on the cause of Marpessa Dawn's death. However, according to the available information, Marpessa Dawn passed away on August 25, 2008, at the age of 74. She was an American actress, dancer, and singer who rose to prominence in the 1950s and 1960s. While her cause of death is not publicly known, her legacy as a pioneering black actress and dancer in Hollywood remains significant to this day.