public boolean killHuman(Human human) {
		if (null == human) {
			return false;
		}
		
		
		Iterator<Integer> iter = this.playground.keySet().iterator();
		while (iter.hasNext()) {
			Integer potentialVictimKey = iter.next();
			Human potentialVictim = this.playground.get(potentialVictimKey);
			if (potentialVictim == human) {
				this.playground.remove(potentialVictimKey);
				return true;
			}
		}
		
		return false;
	}