He couldn't have found out @1:00 as the 911 call was at 1:30.
He had spoken to a lawyer by phone and he had a heads up from friends that police were very suspicious of him. Innocent people need to be especially careful because nothing was planned and because things in their life could potentially look suspicious. (Consider MM affair)
A killer will have planned everything out for the premeditated crime so could actually appear to look less suspicious.
I have to say that there was a time in my life where I said and thought the same thing --- What's there to hide? Talk to police. They're good, they just want to help find the killer. Now I know differently after watching the Cooper trial just how badly things can go and I would never talk to them and would advise all of my friends not to either. I would answer written questions from them, maybe but that is it.
Many, many people have been exonerated from faulty police investigations when many years later new evidence comes to light. It happens and you can't be too careful. They don't always have your best interest at heart when trying to solve a crime. They do get tunnel vision especially with a spouse.
However, even though JY opted not to talk to police, ironically he was convicted for that very reason. The jurors heard that he refused to talk, refused to respond to the civil claims and that was really the main difference btwn trial 1 and 2 and we know how the jury voted in trial 1. So, remaining silent actually was used against him. Yes, it was overturned because of that, but the prejudice of a conviction is difficult to overcome by anyone. He will have to face a 3rd trial with the jury knowing that he was already convicted of the crime. That can never be undone. What was done to him was extremely harmful and in my opinion the State should drop the charges and let him go. If they had solid evidence they never would have resorted to unlawful tactics to win. They were desperate and crossed their fingers that it wouldn't come back on appeal and they lost but the can is kicked down the road now for a new DA to deal with.