Snape's Plot

Albus Dumbledore trusts Severus Snape. Let us not presume that the foundation of this trust is based merely the fact that Snape begged for it, pleading that he is now innocent. Dumbledore, not only the greatest, most intelligent wizard alive, was also a member of the Wizengamot, and was already immune to such pleas from numerous Death Eaters claiming they are reformed in their ways, especially after the fall of Voldemort. Snape must have performed other deeds to warrant his relationship with Dumbledore, which will hopefully be spoken of Book Seven. These deeds were, obivously, either genuine or a ploy masterminded by Snape and Voldemort to fool Dumbledore. However, trickery is one thing, let alone creating an illusion upon the most intellectually gifted man alive that one of the most loyal servants of his greatest enemy has become a powerful ally is another. (That is, of course, without the use of Polyjuice Potion or any other disguising measures.)
So now that we have established that Snape is probably on the side of Dumbledore, let us theorize as to why he murdered him. (Before we begin, however, I would like to note that all comments I make in the following paragraphs are made as if Snape is in fact against Voldemort.)
Firstly, let us begin with the Unbreakable Vow. I believe Voldemort had already asked Snape that, should Draco fail to kill Dumbledore, Snape would perform the task himself. Snape, not wanting to blow his cover, agreed to it. However, when the time came to murder Dumbledore, that is when Snape would show his true allegiance and refuse to do it,and probably be killed by Voldemort for his betrayal. Better than being murdered on the spot for refusing Voldemort's wishes. This way, he can continue to spy for another year. Since he had already promised Voldemort that he would kill Dumbledore, denying to Narcissa Malfoy that he'd do it would blow his cover as well, even if it were in an Unbreakable Vow. Snape had already accepted his death to come soon.
Next, let us move on the conversation between Draco and Snape overheard by Harry. When Harry reported this to Dumbledore, Dumbledore become aware of the vow. He knew that either he or Snape must die. Valuing the life of a spy who could help Harry through the inside more than his own life, Dumbledore ordered that Snape should murder him to save himself. However, Snape was not so easy to convince, as he is loyal to Dumbledore and would rather sacrifice himself for Dumbledore. This is what they were arguing about when Hagrid overheard. Snape refused to assassinate his true master.
Finally, we reach the actual murder. After Snape entered, Dumbledore pleaded with him. Why would Dumbledore plead? Even if he were about to die, that is below him. Plus, Dumbledore has his defenses even without a wand. Fawkes, for instance, would have come to his help had he wanted it. Dumbledore, a small, agile man, could have attempted to dodge the curse. Weak as he was, when one is endangered, they suddenly become stronger, faster. Harry has blown up his aunt without a wand. Why couldn't the greatest wizard of all time do something similiar, especially when he was one-on-one with Draco, a small boy? No, Dumbledore pleaded not for his life to be spared, but instead that his life be sacrificed. This is why Snape appeared revolted. He has no reason to hate a man who has saved him from Azkaban, given him a job when all others thought him evil. He only has reason to hate having to kill that man.
After the murder, had Snape been evil, he would have taken Harry to Voldemort with him to finish him off. Snape did not even fight back against Harry. Snape has never attempted to hurt Harry or Dumbledore before, not even if Book Five when Voldemort had returned, and did not attempt to hurt anyone else even after people believed him to be evil in Book Six.
This is why I believe the murder of Albus Dumbledore by Severus Snape was planned and masterminded by the victim himself.

This is perfect- you've created a very firm defense. I'd like to add that Snape, knowing his cover was going to be blown, had the option of taking out Granger and Ginny Weasley- a Mudblood and blood traitor- as well as one of Dumbledore's staunch allies, Flitwick. Instead he merely knocked Flitwick out and pretty much ignored Granger and Weasley.
The only person he attacked was Dumbledore.

I agree with you on most of these terms....... But I do not think Dumbledore is really dead! I think Dumbledore and Snape had plotted a plan to allude all on lookers (and readers alike) into believing Dumbledore is dead. Well Thats my theory at least! I'm not ready to believe he is gone just yet!

I agree that the murder was staged. I think that the reason that Snape and Dumbledore were arguing is that Dumbledore was giving the same ultimatum to Snape that he gave Harry- to do what he says, no matter what Snape wants to do-to do what is necessary for the cause, not what is easy. I think Dumbledore knew there would come a time where he would be vulnerable to Voldemort and his Death Eaters, and in such an occasion he wanted Snape to kill him. Why? because Dumbledore could've been taken by the DeathEaters to Vold., and without a wand and in such a vulnerable state, could've been tortured, been given Veritaserum, all sorts of things. And Dumbledore knows too much (ie. the location of OoTP headquarters, members of the OoTP, etc.)to have that happen to him. Plus in such a state he could reveal Snape's situation to all of the bad guys, and then they both would be doomed.
I think the hateful look Snape had wasn't hate for Dumbledore, but hate for himself, and the situation. I'm not saying that at the end Snape will be all good and buddy-buddy with Harry, but I do think Harry will realize that everything, Dumbledore's death, Snape's supposed betrayal, and so on was to contribute to the success of his mission- killing Voldemort.

A few points:
1.) Snape had ever opportunity to harm Harry while fleeing with Draco, why did he just deflect the curses? He couldn't Aveda Kedavra him, b/c "harry's for the dark lord", but he could've Stunned him and taken him to Vold. And honestly, if Snape was really Voldemort's favorite and most skilled servant, then he could've resurrected Voldemort, killed Harry, and whatever else in the 6 years Harry's been at school. He had several opportunities when Harry was vulnerable for him to do so. And I thought that the main sign of a truly faithful servant would be one who would do anything, even sacrifice himself to serve his master. So why hasn't Snape done anything to Harry except be mean to him?
2.) I think in the beginning, Snape liked Lily, or had a relationship with her, or they were friends, or something , and that's why he regretted Lily and James (or just her?) deaths. That's what changed him. I don't think he's a lovable person and never will be, I think he had a bad childhood with bad circumstances and that's why he's such a "tortured soul." However, "tortured souls" can still become good souls. He's probably become a spy to do penance for all his wrongdoings as a Death Eater.
3.) I think Dumbledore is for sure dead. As much as it sucks, it's true. And I think it was necessary for Harry to get the strength and resolution to do what he has to do. The book says that Harry couldn't be dependant on a mother/ father like figure to protect him. Congratulations, he's become a man, and at a very harrowing and sad cost. He won't have Dumbledore, or Sirius, not even Hermione and Ron to turn to at the end. It will be him and Voldemort. But hopefully (and this has been stressed in every book) LOVE for his friends and the deceased with ultimately give him the strength to defend himself. I can't help but wonder (and hope!) that Harry will have some extra hidden powers which will blast Voldemort off of the face of the earth, but alas, I'll have to wait approximately 2 more years for the answer to that.

My last point- this series has been compared to LOTR and Star Wars. In both good defeats evil, and I think the Harry Potter series is no different. Who is on the side of good and who is on the side of evil is still yet to be determined, but I have faith that Harry and the wizarding world's existence is not going to end up a big ol' stinking pile of poo, but happiness will prevail in the end.

The end of my novel, my fingers have gotted rigor mortis from the excessive typing. Ow

i'm sorry, but there is no way that the murder was staged! dumbledoor wouldn't have been pleading with snape. also, he knows that he is more important to the order than snape is. anyway, being hit with avadacadabra would probly kill you, not to mention being blown out of a window. and don't you think he would have told the order? or at least harry or magonigal.

The murder was most likely spur of the moment- who could he have told in the five seconds before Snape blasted him off the tower? Besides that, Dumbledore can only do so much for the order- direct other people where to go, so to speak. Snape, under the influence of that Unbreakable Vow, would be more able to change things what with his connection to Tom, which would be strengthened by taking out one of his biggest rivals.
Plus you're not looking at the whole situation- Snape could've killed Ginny, Flitwick, Hermione, Harry- everyone he came in contact with, really. His cover was going to be blown anyway, what did it matter if he took out a few mudbloods and blood traitors?

yes, but J.k said that someone was going to die. also, ha couldn't kill harry because voldemort wanted to kill him, and if someone saw him murder hermione or ginny, his cover would have been blown before he could kill dumbledoor. <_< <_<