Has it really been that long ago? Wow. Now I do feel old. I guess I didn't place the timing because they continue(d) to use his name. Even 'Earth Final Conflict' and some other show that now escapes me had his name on it.
There's plenty in TOS and TNG to convict him, though.. hehe
That's okay. I can't remember a lot of things either. If memory serves, he died during year 5 (of TNG), and there was a little "in memory" blurb on a two parter that Leonard Nimoy did.
I think the "Final Conflict" thing has to do with some idea he had a long time ago, maybe even shopped around with no luck. His wife Majel runs his estate.