In the end of the seventh book. She originally goes for bellatrix because she almost hit Ginny with a killing curse and says "not my daughter, you bitch!" it's the best thing ever. :)
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Arthur Weasley didn't kill anybody throughout the series. His wife, Molly Weasley, killed Bellatrix Lestrange.
Molly Weasley killed her after Bellatrix was dueling Luna, Hermione, and Ginny together, and she shot a killing curse to Ginny but missed and aggravated by the death of Fred she doesn't want her ONLY daughter dead so she shot a curse that hit Bellatrix on the chest.
In the Harry Potter film series, Molly Weasley kills Bellatrix Lestrange during the Battle of Hogwarts in the movie "Harry Potter and the Deathly Hallows - Part 2." The scene takes place towards the end of the film, during the final confrontation between the Order of the Phoenix and Death Eaters. Molly's act of defeating Bellatrix showcases her fierce protection of her loved ones, particularly her daughter Ginny and surrogate son Harry Potter.
Page 736 and 737 of Harry Potter and the Deathly Hallows.
Bellatrix Lestrange was born in 1951 and died in 1998 by the hands of Molly Weasley. That means that she was about 47 years old when she died, quite young.