My guess would be that he's supposed to be Mexican
However I don't remember his nationality ever being explicitly stated in the film.
( Lord Gnome, Wed 27 Aug 2008, 12:32, archived)

yeah you do get a few Hispanic bad guys as well,
usually with enormous Spanish villa style mansions, featuring a swimming pool and drugged up prostitutes.
( Moon Girl Technologies horrendous beanbag, Wed 27 Aug 2008, 12:38, archived)

The plot of the film basically involves a drug deal gone terribly wrong
It was organised by Mexican gangsters, a lot of the action takes place in Mexico and the character is definitely not American. The actor is Spanish too, so that's what I'm basing my guess on.
( Lord Gnome, Wed 27 Aug 2008, 12:45, archived)