Board Thread:Questions and Answers/@comment-30860737-20161227003014/@comment-1721267-20161228090501

And that is also likely how Sinbad acquired Zepar, who was previously owned by Serendine. While it is not yet confirmed in Adventure of Sinbad that she does indeed die, it is most likely what will happen; in that case, Djinns acquiring a new owner after their original owner's death would make sense.