Pavonis Interactive Forums

I killed the Viper King. I know i did, and i have a soldier wearing his skin. A few missions later, the Viper King reappears. I killed him again ( he was low health, at least), but I got the "we must research this" message, after getting back to the ship.
Latest publicly available patch.

Yep sometimes it happens, had the same with Archon King.

To clarify now that 1.2 is out, this was with LW: 1.1