My guess is that Mrs. Woods new about an instance or a specific woman who wasn’t any of these and what set her off wasn’t the original confession but his answer to a question about how many.
The word is that Rachel and he were texting the night of the accident. Elin ask - “who are you texting?” She grabbed the phone from him. The phone supposedly broke and their was a struggle. My guess is he was semi drunk and said he was going out. Jumped in the SUV and she was hammering it with a golf club.
I feel sorry for the wife. He is slime.
I’m guessing an inconveniently timed and themed text message or phone call intercepted by wifey. Of such small events are great catastrophies made.