Conversation so far:
What things did Richard III of England like to do?
What did Richard III of England do to get his way?
Literature portrays Richard III of England as a man motivated by personal ambition, who uses everyone around him to get his way.
How did Richard III of England use people?
Who did Richard III of England murder?
Edward and his younger brother Richard, Duke of York, were not seen in public after August and accusations circulated that they had been murdered on Richard's orders.

Question: Why did he murder them?
Self-contained rewrite: Why did Richard III of England murder them?