Passage: Elliot Stabler is a fictional character portrayed by Christopher Meloni and one of the lead characters on the NBC police procedural series Law & Order: Special Victims Unit during the first twelve seasons. As a result of Meloni's sudden departure from the cast at the end of the twelfth season, Stabler abruptly resigns from the police force off-screen during the thirteenth season premiere.

Question: Based on this passage, how did they write detective stabler out of svu?
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The important part for answering this question is: As a result of Meloni's sudden departure from the cast at the end of the twelfth season, Stabler abruptly resigns from the police force off-screen during the thirteenth season premiere.
So, the answer is Stabler abruptly resigns from the police force off - screen during the thirteenth season premiere.
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