public OnPlayerSpawn(playerid)
{
    SetPVarInt(playerid, "killerid", INVALID_PLAYER_ID);
    return 1;
}
public OnVehicleDamageStatusUpdate(vehicleid, playerid)
{
    if(GetPlayerVehicleID(playerid) != vehicleid)
    {
        for(new i = GetMaxPlayers() - 1; i != -1; i--)
        {
            if(!IsPlayerConnected(i) || IsPlayerNPC(i) || !IsPlayerInVehicle(i, vehicleid)) continue;
            SetPVarInt(i, "killerid", playerid);
            break; // если только водителя убивать, если и пассажиров - убирай строку
        }
    }
    return 1;
}
public OnPlayerDeath(playerid, killerid, reason)
{
    if(killerid == INVALID_PLAYER_ID) killerid = GetPVarInt(playerid, "killerid");
    if(killerid != INVALID_PLAYER_ID) SendDeathMessage(killerid, playerid, 49);
    return 1;
}