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"I do feel as though we may be on one of our final laps around the track," Miller, who plays Michael Scofield, said in a recent conference call to promote Prison Break's return.
"It is something that weighs on my mind from time to time. Telling a story correctly necessitates knowing when to end it."
He continued: "At this point in the series, Michael and Lincoln between them have intentionally or unintentionally killed so many people and yet they're still running around with T-Bag - a maniac, a psychopath and a child killer and a rapist.
"Eventually, you have to wonder when is enough enough because it really makes my character look bad. These are the questions that I think eventually we have to answer or else suffer a fall-off in terms of believability and quality."
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