Cathleen Lewis was found beaten to death in her Naperville home last June. Police looked for her younger brother, Mark Lewis, to notify him of her death. After not finding him, the brother soon became a suspect in the sister's murder.
Now, six months later, Mark Lewis has been formally charged with murder. Lewis was eventually found in a Florida parking lot and is being sent back to Illinois to hear the criminal charges against him, reports the Chicago Sun-Times.
So what would drive a brother to kill a sister?