According to the story, he killed hundreds of people, or more likely, thousands of people - not just seven.
Yes, he does kill Lord Voldemort in the end of Deathly Hallows.
Destroy the horcruxes
Lord voldemort is the person who killed harry's parents and he is now seeking to kill Harry
It was never about killing somebody, it was about stopping Lord Voldemort from killing more innocent people. Unfortunately, the only way to do that was to kill him. Harry wanted to stop Voldemort from hurting his friends, family and lots of innocents witches, wizards and muggles. Voldemort started a war, Harry ended it.
Lord Voldemort's death eaters didn't kill him because they were his followers, they believed in what he was doing and thought he was right. They didn't kill Harry Potter because Lord Voldemort specified that he must be the person who killed Harry.
Voldemort killed James with the Avada Kedavra killing curse.
No, but instead Lord Voldemort killed Snape because he was the only one who knew the last horcrux except Lord Voldemort.....
Harry potter kills Voldemort ( aka "you know who" or the dark lord or He Who Must Not Be Named
Yes, Ron destroyed one of Lord Voldemort's Horcruxes - killing a piece of his soul.
He himself is not a book; Lord Voldemort is a character in a series of books titled "Harry Potter." He is the antagonist trying to kill Harry.
Book 7
The killing curse, Avada Kedavra.