Sirius Black was the Godfather of Harry Potter. He was wrongly convicted of murdering 12 muggles and Peter Pettigrew by Barty Crouch Sr. and spent twelve years in Azkaban. Sirius escaped by turning into a dog and slipping between the bars of his cell. Sirius came to Hogwarts, searching for Harry. He, along with Professor Lupin, tracked Pettigrew to the Shrieking Shack. It was revealed there that it was Pettigrew who sold Harry's parents to Lord Voldemort. Sirius later escaped on Buckbeak the Hippogriff. He was later killed during the Battle of the Department of Mysteries by his relative, Bellatrix Lestrange, when she used a curse and Sirius fell into the veil in the Death Chamber, which was a passage to the afterlife.