I'm not sure, but I think it's a bug. Because by analogy, after passing the temple of Shar - I could not resurrect killed in the first act on the shore Shadowhart (her quest, one of the main points, without her was executed) and similarly, could not resurrect Laezel, after the destruction of the Git temple. Given that you can't talk to him and he's reading a book...
But this it's sad to watch. Even after his death, there's his no peace.(
