Hate that it turned out the way it did but at least you know. Also.....just throwing this out there..... probably not EHD / blue tongue if you believe you saw him in November. As frost in October and cooler temps take care of the midges that spread it. You also normally find EHD deer near water sources concerning the fever that accompanies it. My guess would be he died from a bullet or a Rage to find him in a bedding area like you did.