|Dick Tracy (1990) [Lips Manlis]: Drowned/suffocated when William Forsythe (acting on Al Pacino's orders) covers him in wet cement and throws him in the river. (Thanks to Jason)
Goodfellas (1990) [Paul Cicero]: Dies (off-screen) of respiratory failure, some time after the end of the story; his death is mentioned in the on-screen text at the end of the movie.
Repo! The Genetic Opera (2008) [Rotti Largo]: Dies of cancer, collapsing on the stage after shooting Anthony Stewart Head.