I know folks need to know that he did not suffer at the end, he did not end his life in a crises. it looks to me like he passed easily in his sleep. he ate really well at all meals yesterday and was bright and happy and alert. I checked him in the cameras at midnight when I went to bed and he was drowsing over his stall door. when I found him this morning, he had not been gone long, he was laying down in his usual sleeping position, no sign in his stall of a struggle or any distress so I do not think he colic'd, and the other horses were all very calm and relaxed.
I think he just decided it was his time to go and he went.