The official Xinhua News Agency reported today that the recently issued indictment said Bo's wife, Gu Kailai, had a falling out with Briton Mr Heywood and worried that it would threaten her and their son's safety.
It is claimed Gu killed Mr Heywood to stop him revealing she illegally moved billions of dollars abroad. She was reported to have confessed to his murder in June.
Gu allegedly gave a detailed description of how she committed the murder and admitted taking bribes.
Authorities believe she transferred $6 billion (£3.85 billion) to accounts under the names of relatives and friends in the U.S., Britain and other countries to hide undeclared income she had been receiving since the early 1990s.