I believe it is Regalus Black, and the house on Grimmald Place will feature again in the horcrux search. On one of the (nutty) HP theory sites someone mentioned that Ron found an unopenable locket when they were cleaning there.
Also, Regalus was never determined to be dead. He just disappeared.
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branchandroot
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Date: 2007-03-17 06:49 pm (UTC)Also, Regalus was never determined to be dead. He just disappeared.