* Unclear circumstances: Some deaths attributed to Bellatrix may have been caused by others in the chaos of battles. For example, the death of the Longbottoms' parents is often attributed to Bellatrix, but the specific details of their torture are never fully revealed.
* Off-screen deaths: Bellatrix was known for her cruelty and likely killed many people off-screen throughout her life.
* Focus on specific characters: The books and movies focus on the main characters, so some of Bellatrix's victims may not be mentioned or highlighted.
However, we know that she killed:
* Dobby: Bellatrix accidentally killed Dobby in the final book, using a magical knife.
* Frank and Alice Longbottom: While the details are not explicitly stated, Bellatrix is heavily implicated in the torture that led to their insanity.
* Several Order of the Phoenix members: Bellatrix killed multiple members of the Order of the Phoenix, though the exact number is unknown.
* Other witches and wizards: It's highly likely that Bellatrix killed numerous other witches and wizards during her time as a Death Eater, including in the Battle of Hogwarts.
Therefore, while a precise number is impossible to determine, Bellatrix was undeniably a prolific killer, responsible for the deaths of many innocent people.