In her estimation, in an attempt to protect the true Harry's identity, Snape sacrifices Hedwig, thus keeping the other Death Eaters off his scent albeit for only a short time.
According to the films, Hedwig's killer might have been Selwyn, who was known to be pursuing Harry and Hagrid at the time since Hedwig's death in the film happened quite a while into the fight when there was only a couple death eaters following them, or it might have been Stanley Shunpike under the Imperius Curse.
Why did the Death Eater stop chasing Harry after killing Hedwig?
Upon witnessing this, the Death Eaters broke off pursuit, realising this was the real Harry as they considered the Disarming Charm Harry's "trademark" spell, and fell back to inform Voldemort.
According to her, Hedwig's death symbolizes the loss of Harry's innocence as he came of age, so it was very fitting for her to die during the Battle of the Seven Potters in the most obscure book of the series.
She was struck down by a killing curse when Harry and his friends — who were all disguised as Harrys thanks to the polyjuice potion — tried to leave Privet Drive at night, only to be tailed by a group of masked Death Eaters.
To defend her students, McGonagall casts a series of spells Snape's way, but he manages to evade all of them before flying away. But what McGonagall doesn't know is that Snape is actually a double agent working for Dumbledore, so he has no intention of harming her.
Following Hedwig's death, Harry continued to keep a snowy owl to honour her. During the Calamity which happened across the wizarding world in the 2010s, a mysterious Foundable of Hedwig's memory appeared throughout the world, which was trapped in a whirlwind Confoundable.
Mundungus' betrayal caught Moody by surprise and gave Voldemort enough time to cast the Avada Kedavra and kill Mad-Eye Moody. After he was brutally killed by Lord Voldemort, Moody's dead body tragically fell from his broom.
Harry describes Umbridge to Sirius Black, saying that she's vile enough to be a Death Eater, despite not being one. Umbridge is also depicted to be a prejudiced person, despising half-breeds and Muggle-born witches and wizards to the point of firing Hagrid due to his half-giant birth status.
At the beginning of the Battle of Hogwarts, the Death Eaters invaded the home of the Acromantula and drove them to attack the school. When the spiders attacked, Hagrid ran forwards to protect them. Acromantula are horribly strong, so it is likely that they captured him and took him to Lord Voldemort.
Remus fought at the Battle of Hogwarts on 2 May 1998, during which his wife was murdered by Bellatrix Lestrange. Remus was also murdered by Death Eater Antonin Dolohov, during the first half of the same battle. His death was possibly avenged by Filius Flitwick.
Rowling stated in an interview that Lupin and Tonks died to compensate for the last-minute reprieve she gave to Arthur Weasley when he survived a would-have-been fatal attack in Harry Potter and the Order of the Phoenix. Rowling also stated that it was Antonin Dolohov who killed him.
Harry came across a witch named Hedwig in the book 'A History of Magic' by Bathilda Bagshot. He liked it, so he named his owl after her. The name Hedwig is of German origin.
McGonagall later learned that Snape was secretly Harry's protector and had killed Dumbledore at Dumbledore's request. McGonagall then made a controversial decision to add Snape's portrait in the Headmaster's Office as a testament to his bravery.
If at full capacity, defending everything she held dear, the new Headmistress McGonagall was unable to defeat Snape. It suggested the latter was the more powerful professor.
Although he wasn't turned into a werewolf, he did develop some wolfish tendencies such as a liking for very rare steaks. He married Fleur on 1 August 1997, although their wedding was disrupted by the arrival of Death Eaters following the fall of the Ministry of Magic.
Fred was killed in an explosion possibly caused by Augustus Rookwood. One of the last things Fred heard before dying was Percy joking about resigning from the Ministry. Percy wouldn't leave Fred's side until Harry and Ron helped him move the body to somewhere safer, coincidentally behind a suit of armor.
According to the films, Hedwig's killer might have been Selwyn, who was known to be pursuing Harry and Hagrid at the time since Hedwig's death in the film happened quite a while into the fight when there was only a couple death eaters following them, or it might have been Stanley Shunpike under the Imperius Curse.
