Kill from the Grave

Death from the Grave is a medal awarded in Halo 3 Multiplayer for killing somebody after you have died. It is represented by a platinum eight-pointed star with a face in the middle. This would usually occur from a grenade or Needler rounds detonating after death, or a slow moving projectile such as a rocket making contact after death. It can also be given when a vehicle's driver is sniped out and the vehicle splatters an opponent. This commonly happens during jousting on Narrows. As this medal is awarded, a message appears on the screen, saying "You killed (player) from the grave". Note that you cannot get this medal immediately after you die, there is a brief waiting time between your death and the death of the person you killed that needs to be met to receive this medal.

An easy way to gain this medal is by throwing a grenade at your feet during an imminent death. You'll be surprised how many people will run past your body after you are killed.