what happened to scout and jem's mother in the bookwhat happened to scout and jem's mother in the book To Kill A Mockingbird: Part one

Scout and Jem's mother as a result of a heart attack.

Our mother died when I was two, so I never felt her absence. She was a Graham from Montgomery; Atticus met her when he was first elected to the state legislature. He was middle-aged then, she was fifteen years his junior. Jem was the product of their first year of marriage; four years later I was born, and two years later our mother died from a sudden heart attack.