private void handleNpeDeath(Entity subject) {
    EntityDamageEvent cause = subject.getLastDamageCause();

    // Increment the NPE's total death stat
    NpeData npeData = this.plugin.getNpeDataByClass(subject.getClass());
    npeData.incTotalDeaths();

    // Increment the ServerData statistics
    plugin.serverData.incNpesKilled();

    if (cause instanceof EntityDamageByEntityEvent) {
      Entity predicate = ((EntityDamageByEntityEvent) cause).getDamager();
      if (predicate instanceof Player) {
        // The NPE was killed by a player, reward them for their accomplishments
        PlayerData killerData = this.plugin.getPlayerData(((Player) predicate).getName(), "");
        String mobName = this.plugin.getSimpleClassName(subject.getClass()).toLowerCase();

        if (mobName.startsWith("craft")) {
          // it looks like a lot of the class names follow the format "CraftX", such as "CraftWolf"
          // or "CraftCreeper"
          mobName = mobName.substring(5);
        }

        if (killerData.getMobsKilled().containsKey(mobName)) {
          killerData.incMobsKilled(mobName);
        } else {
          plugin.log.info("MineJMX: A player killed an unknown mob type (\"" + mobName + "\")");
        }

        // and increment the NPE's specific death stat
        npeData.incDeathsByPlayer();
      } else {
        // The NPE was killed by another mob, increment NpeData statistics again
        NpeData killerData = this.plugin.getNpeDataByClass(predicate.getClass());
        killerData.incNpesKilled();

        // and increment the original NPE's specific death stat
        npeData.incDeathsByNpe();
      }
    } else if (cause instanceof EntityDamageByBlockEvent) {
      // killed by environment, increment the specific death counter
      npeData.incDeathsByEnvironment();
    } else {
      // drowned, burned, fell, etc...increment the environmental death counter
      switch (cause.getCause()) {
        case CONTACT:
        case DROWNING:
        case FALL:
        case FIRE:
        case FIRE_TICK:
        case LAVA:
        case LIGHTNING:
          npeData.incDeathsByEnvironment();
          break;
      }
    }
  }