Someone will die on the Hawaii Five-O season finale. This much we know.

But executive producer Peter Lenkov teases to TV Guide that Steve McGarrett might play a key role in the demise of this unnamed character. Could the detective's obsession with Wo Fat prove costly?

"McGarrett is a guy who goes to extremes," Lenkov says. "I think he's going to go further than he's gone all season and he's going to be very reckless."

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