In the 7th and last book "Harry Potter and the Deathly Hallows"
Chapter 36, titled 'The Flaw in the Plan'
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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.
Page 736 and 737 of Harry Potter and the Deathly Hallows.
Ginny Weasley's full name is Ginevra Molly Weasley.
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.