"Heywood told her that if she thought he was being too greedy, then he didn't need to become involved and wouldn't take a penny of the money, but he also said he could also expose it," one source told Reuters. "After Gu Kailai found that Heywood wouldn't agree to go along and was even resisting with threats – that he could expose this money with unknown provenance – then that was a major risk to Gu Kailai and Bo Xilai."