Dark Blood is an unfinished film (circa 1993) about a character named Boy (played by River Phoenix). Boy is a widower who lives as a hermit on a nuclear testing site, waiting for the end of the world while making dolls that he believed had magical powers. Boy ends up helping a couple (played by Jonathan Pryce and Judy Davis) when their car breaks down as they are traveling through the desert. Dark Blood was written by Jim Barton and directed by George Sluizer.
Dark Blood was never completed due to the death of River Phoenix in 1993. The crew was 11 days shy of completing production. After Phoenix's death, his mother was sued because of loss of expenses, as the film had to be abandoned.
As of late, what was finished of the film is owned entirely by director George Sluizer (also known for the movie The Vanishing). He has hinted that he intends to use it as footage in a documentary about River's life.
Recently, some raw footage of River Phoenix in "Dark Blood" has shown up on YouTube. This is the last released footage of River Phoenix, and the only part of the film made public, and can be viewed here.