Harry had been picturing his parents’ deaths over and over again for three years now, ever since he’d found out they had been murdered, ever since he’d found out what had happened that night: Wormtail had betrayed his parents’ whereabouts to Voldemort, who had come to find them at their cottage. How Voldemort had killed Harry’s father first. How James Potter had tried to hold him off, while he shouted at his wife to take Harry and run … Voldemort had advanced on Lily Potter, told her to move aside so that he could kill Harry … how she had begged him to kill her instead, refused to stop shielding her son … and so Voldemort had murdered her too, before turning his wand on Harry.

J.K. Rowling