Find out who cut the whore

Find out who cut the whore is the third task you get from Marion. You start by going to the Malamute Saloon to question the bartender, and he shows you a Morningstar Mine scrip. When you go to the Morningstar Mine and ask around, Obidiah Hakeswill will confess right away. From there you can kill him for $500 from Marion but no quest xp, let him go for no xp and no money from the sheriff, or take him into custody (the best option) for 1250 xp and $500.