can somebody tell me why kiname killed shizuko n wat was da relationship b/w them?

Kaname-sama killed Shizuka Hio, because he was only protecting the one person he loves. The only relationship they have, is that they are both pureblood, but that's all there is between them.

Ok, what I understood was this: Kaname wanted to kill Rido, for this he should be madami powerful, so, he took Shizuka Sama's blood, and he did it also, so Zero could drink it, become a vampire and protect Yuuki. Then, when he was a little boy, he met Shizuka, when she was eating or something like that, and Shizuka told him that it was pity he's a Kuran; of curse he got mad. With the time, Shizuka became Rido fianceé. but when she fell in pag-ibig with a man, Rido manipulated the "list" so this man would be killed. The ones who killed him where Zero´s parents, and then you know what happened, she wanted revenge and all that stuff. Dadaaa! As you see it may be pretty confusing.

kaname killed the hurazaki hime because he needed power to protect yuki (his loved one)because sooner or l8a she would face danger and to get zero to drink from her so he could protect yuki from rido and shizkaand so yuki could avoide her fate as a pureblood vampire (wtch was hard and didn't work but...)the relation ship b/w nothing there was no relation ship b/w so don't worrie its easy get it!!!

He killed her to get madami powerful, becuase there is going to be a fight with the other pure bloods. I also think this is the real reason he has been useing Zero too. I think he wants to take the pure bloods down. (I still dont like him and I think he is very evil)