I've been DMing a Second Edition AD&D game. The fighter of the party got really upset because an NPC thief knocked him unconscious and took a potion of giant's blood off of him. He thought that the thief of the party, one of my other players stole it from him. The fighter then chose to kill the party's thief. And after that he killed the party's mage who tried to stop him. However the thief had a variety of poisons in similar canisters to the one the potion of giant's blood was held in. The fighter then decided to find out which one was the potion by tasting them; yes, he willingly drank poison. I asked him if he really wanted to take the chance? His exact words were "I take a single gulp". So he did swallow whatever was in the canister. I made the player roll a D6 in order to decide which canister he drank. He rolled the option that I chose to be the green dragon acid, I ended the session here so I could find out what occurs.
This character is dead right? Should there be a system shock check, or is the internal damage just simply too extreme?