I just wanted to write that
He did not.
yes, snape kills professor dumbledor with the killing curse in the half-blood prince
He runs along with the death eaters.
Severus Snape used a killing curse on Albus Dumbledore.
Nagini killed him, under Voldemort's orders. He was killed because Voldemort thought that Snape was the master of the Elder wand, and by killing him, he would be the master; however, this was not the case.
Albus Dumbledore died after Severus Snape hit him with the killing curse. Dumbledore had previously told Snape that when the time came, it must be Snape who killed him. This was to prevent Draco Malfoy from having to do so and to also ensure that Dumbledore died the last master of the Elder wand. However, as Draco disarmed Dumbledore, that part of the plan failed.
No, he was told to kill Dumbledore by Dumbledore
Dumvledore was murdered by Prof. Severes Snape by the killing curse " Avada Kedavra" on the highest tower , Astronomy tower.
Albus Dumbledore was hit by the killing curse, Avada Kedavra, which was cast by Severus Snape.
He ran away after performing the killing curse on dumbledore.
Albus Dumbledore was killed with a killing curse by Severus Snape.
Snape killed Dumbledore because Dumbledore asked him to but no one knows except Harry who only finds out in the last book