Trivia: Five-0's film crew once helped the real HPD with a real-life arrest. Ten genuine cops, working crowd control during the filming of an episode, took a break from their guard duties and went into a nearby warehouse. They emerged with several gambling-ring suspects in handcuffs. The police lieutenant explained to the bewildered film crew, "Until today, we couldn't get near this place without tipping these guys off. Thanks for the great front!" The crooks had assumed that all the cops were actors, so hadn't given them a second thought.
Trivia: Hawaii Five-0's first season interiors were shot in a WWII-era Navy warehouse above Pearl City. The creaky building was infested with both rats and mongooses that were so noisy, one director routinely fired a starter pistol at the ceiling to scare them away before filming. Lacking air conditioning, the makeshift soundstage also reached over 120 degrees F when the studio lights were turned on. Fortunately, CBS increased the budget enough for producers to build a new, air-conditioned soundstage for succeeding seasons.
Answer: He was fired. He never really appreciated his character. He felt Kono was portrayed as a big dumb Hawaiian and that the stereotype was racist. He also felt underutilized. He was fired after a heated argument with the show's publicist regarding his character. It seems there's not much details given regarding the incident or the firing, so it's seems possible he upset the show's producers as well.
Bishop73
No he said something derogatory about one of the Jewish producers that's why he was fired.