And of course... just to confuse all these conflicting non-canon sources...
Number One has appeared as a Flint-like Immortal, and the mother of Robin Lefler (and somehow related to Laxwana Troi???) in the recent New Frontier novels by Peter David... But whilst I know he gives her name, I cant remember it as I stopped reading them a long time ago as that was the point they got crap too...
Which makes that non-canon sourse even less useful than the others!
However, Robert April doesn't die, as Commodore April (with his wife) arrives on the Enterprise during Star trek TAS (is it the episode Yesteryear?), which is also a non-canon source! Arggghhhh.
Personally, the only information on the matter is pretty much non-canon, and so you are in a good position to make it up as you go along.
In fact, the only canon information is that;
a - The Enterprise was commander by Captain April.
and b - The photo record they used for Captain April, was a photo of Gene Roddenberry (so at least you know who he looks like).
DanG/Darth Gurden
The Voice of Reason and Sith Lord
“Putting the FUNK! back into Dysfunctional!”
Coming soon. The USS Ganymede NCC-80107
"Ad astrae per scientia" (To the stars through knowledge)