Question about Roger Zelazny's Amber series

[sandmanwake]

I know that Zelazny didn't wrap up the Merlin chronicals well, so he wrote some short stories in an attempt to do so and to wrap up a few other loose ends. I've managed to get my hands on a few of the short stories, but I don't know if what I've got is all of it or just a synopsis of sorts (seems like all of it though). Did Zelazny die before writing anything else after "Hall of Mirrors"? This is the one where Corwin and Luke have nearly killed each other after going into the House of Amber's Hall of Mirrors and apparently the House is awakening to take part in the upcoming struggle where the Spikards are awakening and seeking a return to power. Is there anything more? or am I doomed to forever not know the ending as the author means for the story to end? If this is not the end, where can I find the means to sate my curosity?