They died to protect Harry: if they hadn't died the whole story would be very different or maybe even not have existed. The whole concept of Harry Potter depends solely on the death of his parents.
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James and Lily Potter, Harry's parents, were killed on Halloween at their house in Godric's Hollow.
Voldemort killed him to try to get to Harry..
When Harry was a little over a year old, his parents were murdered by the powerful Dark Wizard, Lord Voldemort
Petunia and vernon dursley.
Harry Potters potronus is a Stag.Answer: nothing. For Patronus see the attached link.
It is a cat, not an owl: Crookshanks