if he injected her with insulin, it would not show up later
He's also reported to have said he picked her up after school that day. Not only did she not go to school that day, but his wife at the time now says he was with her all that night.
This guy is nothing but a vapor trail at this point.
I don't think he had anything to do with it, and am perplexed why he'd come out with this when the Thai authorities said there were no charges pending against him.
Whew! What a mess.