Well it depends on what your talking about. there is also a constellation named Bellatrix. but if your talking about the one in Harry Potter, she was killed by Molly Weasley during the battle of Hogwarts with Lord Voldemort and his death eaters and other creatures that he got to fight on his side in Harry Potter and the deathly hallows part2. to kill Bellatrix, Molly didn't use any unforgivable curse. the spell that she used caused Bellatrix to freeze and become very thin and then explode into a thousand pieces. in my opinion, it was a bad death and a fast one.
Bellatrix Lestrange is one of Voldemort's Death Eaters. Therefore she is a bad guy.
bellatrix does not have a patronus because she is a death eater
She makes it out alive and kills the Death Eater Bellatrix Lestrange.
Bellatrix Lestrange (born Bellatrix Black)
Narcissa and Bellatrix are sisters. Narcissa got married to Lucius Malfoy, Bellatrix became a devoted Death Eater!
Probably Bellatrix Lestrange.
Bellatrix Lestrange was the one who killed Sirius Black in the battle of the Death Eater's and the Order of the Phoenix in the Ministry of Magic.
Bellatrix Lestrange
No one in either Greek myth or the Harry Potter books.
Narcissa's sister is Bellatrix Lestrange.
Bellatrix tortured Neville. Severus Snape, his fellow Death-Eaters Amycus and Alecto Carrow, and some wanna-be-Death-Eater Slytherins like Crabbe and Goyle.
It isn't really known but it is probably Bellatrix Lestrange.