Jesus!
Upon a second reading of the article, i am CONVINCED it is the husband. They mention the son is cooperating, but they do not mention the same of the husband, which they surely would have, had he been cooperating. At first i thought it was just the Herald Sun building suspense; but it is most certainly not. The husband killed his wife and the police need more evidence to convict him, otherwise it is a circumstantial case and a gamble at court in attempting to gain a conviction.
I'm going to chill out now and pause my speculations as i've just done the full 360 and ended up right where i started. sheesh!
The husband murdered the wife, and the nearby Milleara Rd has some significance. I wonder what. I wonder if they own a second property there. I wonder where he disposed of Karen. <mod snip>