George Sluizer was working on Dark Blood with River when the 23-year-old star died from a drug overdose outside Hollywood's The Viper Room in 1993.

The director has now re-edited the material and wants the late actor's younger sibling Joaquin to help him complete the project by recording a voice-over as River's character, Boy.

Sluizer tells the Hollywood Reporter, ""The voices of both brothers are very much alike.""

Sluizer hopes to release the final cut next year (12).