No, Severus Snape did.
Sixteen.
Albus Dumbledore was killed by Severus Snape. Although Dumbledore, who was dying anyway, had already arranged for Snape to kill him so that Draco Malfoy wouldn't have to and so that the Elder wand would not change masters. However, as Draco disarmed Dumbledore shortly before his death that part of the plan did not work.
Voldemort asked him to do so.
Severus Snape or Draco Malfoy
Yes, Severus Snape killed Albus Dumbledore. This was arranged between the two of them so that Draco Malfoy wouldn't have to do it. Dumbledore also wanted to die as the last master of the Elder wand, although this part of the plan didn't work as Draco disarmed Dumbledore shortly before he was killed making Draco the master.
Yes! ---------- How did he? What were his attempts to do so??
This is a very broad question, and not worded correctly. Severus Snape killed Albus Dumbledore in the end of the sixth book. Dumbledore had asked Snape to kill him, to save Draco Malfoy's soul because of the Unbreakable Vow that Narcissa Malfoy made Snape take in the beginning of the sixth book since Voldemort had ordered Draco to kill Dumbledore.
Albus Dumbledore was killed in Harry Potter and the Half-Blood Prince. He was killed by Severus Snape. The job originally fell upon Draco Malfoy, but he was unable to kill him.
Dumbledore wanted Snape to kill him because otherwise Draco Malfoy would have had to do it, or be killed. neither of which Dumbledore wanted. Because he is already slowly dieing from the Horcrux ring that he put on his finger (the reason he has a black arm) and because Voldemort ordered Drako to kill Dumbledore and Dumbledore doesn't want it on Drako's conscience. Also, Snape needed to kill Dumbledore to silence any speculation with the Death Eaters about who's side he is really on. ------------------------------------------------------------------------------------------------ Dumbledore wanted Snape to kill him so that Draco's soul wouldn't be damaged, ripped apart on his acount. When Snape asked "what about my soul?" Dumbledore replied: do you think it would affect you by helping an old man avod pain and humiliation." or something like that.
Yes. Dumbledore told Snape to kill him if Draco Malfoy was not able to so his death would be short and painless.
Yes, Albus Dumbledore was killed by Severus Snape in Harry Potter and the Half-Blood Prince. It was later revealed that Dumbledore had asked Snape to kill him.Severus Snape was killed by Lord Voldemort in Harry Potter and the Deathly Hallows. Voldemort murdered him thinking that, as the person who killed Dumbledore, he was the master of the Elder wand. He failed to realise that Draco Malfoy had disarmed Dumbledore, making him the master, and that Harry Potter had later disarmed Draco, making him the current master.
Harry used the Hawthorn wand that was previously Draco Malfoy's. It went like this:In order to truly own the Elder wand, a wizard would have to take the wand of the current master against their wishes. Albus Dumbledore was the true master of the Elder wand. Draco Malfoy became the next true owner when he disarmed Albus Dumbledore right before his death. However, the Elder wand was buried with Dumbledore. Draco never knew he was the new master. Later, Harry took Draco's Hawthorn wand while he was escaping Malfoy Manor. Since Malfoy was the current master of the Elder wand, this passed the Elder wand's ownership on to Harry. In the meantime, Voldemort broke into Dumbledore's tomb and stole the Elder wand. Voldemort thought that Snape was the new master, as he had killed Dumbledore, not realizing that Draco had disarmed Dumbledore. Voldemort killed Snape and believed himself to be the new Elder wand master. When it came down to the final duel in the Great Hall, Voldemort used the Elder wand that Harry was now master of. Voldemort cast an Avada Kedavra curse at Harry. Harry cast an Expelliarmus spell. Since Harry was the master of the wand Voldemort was using, the Elder Wand would not kill its true master, therefore, Voldemort's Avada Kedavra rebounded off of the Expelliarmus and killed him.