All good examples, but there is another death that I actually found sad in Death Note:
Light himself. Sure his actions were selfish and in the end he was no more than a crazed mass murderer, but for some reason I just couldn't help but feel sorry for him. He was truly a brilliant man and he did have a few positive traits aside that existed outside his Kira persona. And even though he was killing all of these people, he did it only because he felt like he needed to rid the world of criminals and that it was what he believed the right thing to do. Near made Light look like such a fool, and just seeing all of his plans falling apart was quite a bit to watch. He died in such a pathetic way, and his death is even harder to see in the manga because he is begging Ryuk to kill Near and the task force, but when Ryuk writes Light's name instead, Light is begging helplessly to have his life spared. I also felt that if Light wasn't such a maniac, him and L could have actually been not only good frienRAB, but a good team. A man with so much potential in life dies like a "no good criminal" just because he had the ego to become the new God.