I get the sense his second wife (the woman he was married to the last few years of his life) is still alive, as I have seen her interviewed in certain places (such as the new "Fifty Year Mission" book - but those could be old interviews.) Goes by the last name Fernandez now, so must have remarried after his death. His first wife died of cancer; it was a heartbreaking story as they split before she got sick and, when he tried to comfort her at the end, she shunned him and died with bad blood between them. Sad story, but goes to show what a compassionate man he was. His second wife was his high-school sweetheart with whom he reconnected as his first marriage (and his time on Trek, I think) was ending.
As far as what is out there on him, I found the most detailed accountings to be in the Shatner/Kreski book "Star Trek Memories" from the late 1990s, and then, more recently, in the new "Fifty Year Mission" book, which has lots of insight from his secretary Ande, who adored him. I suspect the interviews with Ande are old, as the "cast of characters" list at the beginning of the book is written in a very vague way with respect to her, implying that the authors are not quite sure what her current whereabouts or status are.
M
