He has been released, but still a suspect, pending further investigation.
\ Reading the article, I was waiting for the climax where you say, “Aha! This dude obviously killed his wife.” But said climax never came. Unless the cops have some smoking gun that isn’t mentioned here, this sounds like one of those “Dead wife = guilty husband” rush-to-judgment cases that end up the subject of a Dateline or 20/20 episode.