I'm aware that the situation does not seem to point to his wife as a suspect. All I'm saying is that given how cut and dry this case seems, the police have been very careful to say that while his wife is not a suspect at this time, they are also not ruling out any scenarios, including the possibility that his wife may have been involved.
I'll state one more time, that I am not implying she was involved. I doubt she was. All I'm saying is that her not being a suspect at this time, and having been ruled out as a suspect are two very different things, and from everything I've read she has not been ruled out as a suspect, although evidence made public to this point certainly does not seem to point to her involvement.