Conversation so far:
Where did Maya Angelou grow up?
Marguerite Annie Johnson was born in St. Louis, Missouri, on April 4, 1928.
Who were Maya Angelou's parents?
Maya Angelou's parents were Bailey Johnson, a doorman and navy dietitian, and Vivian Johnson, a nurse and card dealer.
Was Maya Angelou an only child?
Maya Angelou had an older brother, Bailey Jr.
How was Maya Angelou's childhood?
When Maya Angelou was three, her parents' calamitous marriage ended, and their father sent her to Stamps, Arkansas, alone by train, to live with their paternal grandmother, Annie Henderson.
How long did Maya Angelou live in Stamps, Arkansas?
Maya Angelou and her brother Bailey Jr. lived in Stamps, Arkansas for 4 years before their father's return.
Did Maya Angelou and her brother Bailey Jr. move again after Stamps, Arkansas?
Four years later, the children's father came to Stamps without warning and returned them to their mother's care in St. Louis.
Who was Freeman and his relationship to Maya Angelou?
At the age of eight, while living with her mother, Maya Angelou was sexually abused and raped by her mother's boyfriend, a man named Freeman.
Who murdered Maya Angelou's rapist, Freeman?
Four days after his release, he was murdered, probably by Angelou's uncles.

Question: what was the reason he was murdered
Self-contained rewrite: What was the reason Maya Angelou's rapist, Freeman was murdered?