The developing scandal was, of course, overshadowed by the fact that the Sept. 11 attacks occurred the day after Ingram's win, so headlines were largely occupied with that news instead. Still, the investigation at the studio continued, and, according to the BBC, the prize money was halted while they looked into it. Eventually, the investigation turned up a new theory that suggested the Ingrams had put together an elaborate cheating scheme.
Diana Ingram was loosely acquainted with Tecwen Whittock, a college lecturer and another contestant in the pool at the time (he would eventually become the next contestant on the show after Ingram's win). The Ingrams and Whittock put together a plan where Charles, while on the show, would read the answers aloud in the guise of talking through them, and Whittock (or, possibly at some points, Diana) would cough after the right answer. And it apparently worked — until they got caught.