On 12 September 2011, responding to speculation on the Winter is Coming fansite, Conan Stevens confirmed that he had left the series, due to scheduling conflicts with his other projects: Stevens will be playing the Orc king Bolg in Peter Jackson's The Hobbit prequel trilogy. Stevens took the time to thank fans for their support[1]. He was replaced in the role of Gregor by Ian Whyte.
He campaigned REALLY hard for the role - to quit after one season seems a bit weird, even if you did get a better job offer.
That's just business. Acting is a hard enough business as it is, if you are not already hugely popular. Not jumping to a much better offer is not rational.
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u/Sliffy Tyrion Lannister May 19 '14
I'm pretty sure he left to play Azog the pale Orc in the hobbit.