Searched the area I believe he came from. Nothing. Gonna check the area he seemed to be going to in the morning.
Brought the arrow back with me tonight (left it there last night so we could reference where we found it) instead of 8 inches of penetration, I got a little over 10, 5 inches of arrow and broadhead stayed in him. I'm confident he's dead, just gotta find him.
I'd say you're prolly right that the deer is dead. Hope you can find him!