I was always of the impression that the mutineers lived out their natural lives on Pitcairn Island. I hadn't heard they murdered one another.
Just back.
According to a really old Colliers Encyclopedia:
The island was chosen in 1790 as a refuge by 9 of the mutineers of the Bounty, who burned the ship on arrival....The English sailors brought with them from Tahiti six Polynesian men and eleven women. Twenty years later only one of the mutineers, John Adams, remained; all the rest had died, most of them by violence*. Adams ruled as a patriarch over the remaining Tahitian women and the offspring of the group, 35 persons in all.
*It could have been one nutty guy committing mass-murder, I guess.