[member]

while i was working on a possible solution, i see that a possible solution has already been given, while i thought differently of what you want compared to what Miokie thought what you want.

Anyways, i'll post what i did:

What i thought you said was when a player dies hsi score gets set to "0". i.e. the score you see when you press the TAB button. A person who kills someone gets +1 score and if his score is 5 or more, his marker will show to other players. When he dies, score gets set to 0 and marker is hidden.

Untested

pawn Код:

public OnPlayerDeath(playerid, killerid, reason)
{
  SendDeathMessage(killerid, playerid, reason);
  SetPlayerScore(killerid,(GetPlayerScore(killerid))+1); //killer gets +1 score
  SetPlayerScore(playerid,0); // player who dies get 0 score
    UpdateMyMarkerToAll(playerid, killerid);
  return 1;
}

UpdateMyMarkerToAll(playerid, killerid)
{
    for(new i; i < MAX_PLAYERS; i++)
    {
        if(IsPlayerConnected(i))
        {
            if(GetPlayerScore(playerid) == 0) return SetPlayerMarkerForPlayer( i, playerid, ( GetPlayerColor( killerid ) & 0xFFFFFF00 ) );
            if(GetPlayerScore(killerid) >= 5)
            {
                SetPlayerMarkerForPlayer( i,killerid,0xFF0000FF );
                SendClientMessage(playerid,0x99FF00AA,"Your marker is now showing");
            }
            else
            {
                SetPlayerMarkerForPlayer( i, killerid, ( GetPlayerColor( killerid ) & 0xFFFFFF00 ) );
                SendClientMessage(playerid,0x99FF00AA,"Your marker is now hidden");
            }
        }
    }
}

edit: looks like it works miokies did the job from what ArnoVL says