In the fifth installment of the franchise, Sirius — Harry's godfather — was killed by cousin Bellatrix Lestrange during the Battle of the Department of Mysteries.

Which Harry Potter does Sirius die?

The last known surviving bearer of the family name, Sirius, is murdered by his cousin Bellatrix Lestrange in Harry Potter and the Order of the Phoenix.

What does Sirius fall into when he died?

The arch that Sirius Black falls into, during the Order of the Phoenix, is called the Veil. It is the bridge between Life and Death. When Sirius falls into the Veil, he is then dead, due to being in the Afterlife.