From Halopedia, the Halo wiki
Retrieved from "https://www.halopedia.org/index.php?title=Killjoy&oldid=1328947"
This article is about the medal. For the Halo Wars achievement, see Killjoy (achievement).
Killjoy is a medal awarded and in Halo 3, Halo: Reach and Halo 4 multiplayer for killing a player who is on a Killing Spree of five kills or higher. It is represented by an octagon with a crossed-out smiley face in the middle.
In the Halo 3 multiplayer beta, the medal is depicted by a yellow-outlined octagon with an orange interior and a black silhouetted Master Chief based on Halo 2's concept art.