Marston Daughter is the deceased daughter of John Marston and his wife, Abigail. She is briefly mentioned in the Bonnie MacFarlane mission Women and Cattle, the Luisa Fortuna mission Father Abraham, and indirectly in "The Gates of El Presidio" by Javier Escuella.
She passed away prior to the events of Red Dead Redemption. She apparently died of an unknown type of fever, as stated by John. Not much is known about her, aside from the fact that she was still alive in 1906, and likely died not too long afterwards. It is also unknown as to where she was buried, as there are no gravestones bearing her name at any of the cemeteries in-game.
- During "The Gates of El Presidio", Javier indirectly mentions her by saying, "I hope you and your wife and children rot in hell!" This gives a time frame in which she died, falling between when John left the gang and when he lived at Beecher's Hope.
- She is not mentioned at all in the Marston Ranch chapter of the game, which could mean that the Marstons had been able to move on easilly after her death, making it likely that she died very young, maybe being a baby.
- Although John says that religion is a luxury he can't afford in the Bonnie MacFarlane mission "A Tempest Looms", in the Luisa Fortuna mission Father Abraham he says to Luisa, "I have a son at home, and a daughter in heaven."
- In Women and Cattle, John says "I had a daughter but she died. Years before that I rode in a gang." This narrows down the timeline of her death even more. As it is known that John left the gang in 1906 and mentions a gap of "years" in between his daughters death and his time as an outlaw. Using this information, she had to have past away sometime in the years of 1908-1911 for John's statement to be correct.