Off-beat, young American supporting player whose film roles have been somewhat less challenging than his stage work, which has encompassed plays by Shepard, Brecht, Sartre, Beckett and others. Nonetheless, Diehl's vaguely dissipated, all-American features and toothy grin have brought an edge to almost all his performances, particularly as a cheerfully brutal villain in "Mo' Money" (1992), Damon…
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