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Dennis Quaid stars as Sheriff Ralph Lamb on the CBS drama Vegas and the actor dished to ET Canada about the romances and rivalries of the show.

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Inspired by the story of the real-life former Sheriff of Las Vegas, the show is set in the 1960s and follows Lamb as he battles notorious gangster Vincent Savino (Michael Chiklis), who's planning a Sin City take over.

In the midst of all the blood sport and gun play, there's also a budding love story between Lamb and Katherine O'Connell (Carrie-Anne Moss).

"The two characters have known each other all their lives," said Quaid. "There's already a relationship there, but where it's going to wind up ... Who knows?"

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Watch the video for more. Vegas airs Tuesdays at 10/9c on CBS.