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Per Johnson, Imposing an increased sentence under the Armed Career Criminal Act’s residual clause violates due process. If your fiancee had his sentence determined under the residual clause, then he may file a motion with the court that sentenced him, and ask that under the Constitution's guarantee of due process the court redetermine his sentence.
If his attorney has not done so, and has been notified of his desire to do so in light of Johnson, he may also petition the court for relief for ineffective assistance of counsel under Strickland.
Seeing how he has only six months left, one it may be difficult to have his case heard before his release date, and two, that will likely mitigate under the Strickland standard.
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