Mr Gibbons wrote the best-selling book Shadow of the Minotaur.

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"We are certainly anxious to do all we can to ensure that same-sex marriages arrives as swiftly as possible on the statute book, " shadow equalities minister Kate Green said.

BBC: Gay marriage: Deal to allow bill to proceed in Parliament

Before his death, Melanson published Rhodes-Hughes' statement in "Shadow Play, " a book he co-authored with William Klaber in 1997 and one of several Melanson wrote on the Robert Kennedy assassination.

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