I had the same issue, except he wasn't even in the party when he died. I went back to camp at the end of the day and as soon as I entered camp he attacked me. I tried everything to not kill him, but he wouldn't leave combat. He ended up jumping onto a rock in the center of camp and dying.
I jumped up on the rock and looted him, almost dying to the necro aura. I went through the cutscene and then the process for creating the scroll of true resurrection. When I try to use it on him, I get 'invalid target'. He just lays there, all dead and necro stinking.
I tried restarting the game. I tried adventuring further then returning to camp. I tried a regular scroll of res. Nothing seems to work. He said I had 48 hours to res him. At this point I'm resigning myself to not having Gale as a party choice.
i never got to try gale in party aswell, i had him in camp
