It depends on what the image is and who you want to see the image. If you want everybody to see it, then everybody has to have the picture on their hard drive.
This is assuming that you want the same image to be sent to everybody, every time anybody is killed, and that everybody's image (including the server host's) is in the same file:
package YourMod
{
function GameConnection::onDeath(%client, %killers_player, %killers_client, %damageType, %damageLoc)
{
// Send the command to all clients:
for(%i = 0; %i < ClientGroup.getCount(); %i++)
{
commandToClient(ClientGroup.getObject(%i), 'OnPlayerKilled', "Path/To/Your/Image.jpg");
}
Parent::onDeath(%client, %killers_player, %killers_client, %damageType, %damageLoc);
}
};
activatePackage(YourMod);
You'd also need some client-side code, meaning everyone who's on your server would have to download your mod:
function clientCmdOnPlayerKilled(%image)
{
SomeGuiBitmapCtrlInsideYourGUI.setBitmap(%image);
}