Among the suspects suggested in Episode 5 are Frank Colombo, the brother of the late former Jerry Jacobson co-conspirator Jerry Colombo, as well as some of the recipients of the stolen game pieces.

However, not every interviewee thinks the informant is real. In McMillions Episode 5, viewers saw Dwight Baker, a real estate developer who got involved in the scheme, share his theory that what the FBI called an informant was actually information gleaned from wiretapping.

In the HBO documentary, he said: “I think it was the FBI… there was a box across the street from my house on a pole… I’d always questioned what it was. I’ve developed a lot of property, I’d never seen that box.

“I suspected they [the FBI] were eavesdropping onto me, not because of McDonald’s but because of a fellow developer here on the lakes. The FBI came in, the drug enforcement people came in, everyone came in and tied up his s*** Within a week after my arrest and after this went down…that box was gone… To me, I’ve always felt like their story of how an informant, how somebody came forward, I felt like that was bulls***.”

Jerry Colombo’s widow Robin, meanwhile, said that she suspects the informant is Frank Colombo, in the final interview of Episode 5. In Colombo’s own take, he also hints he knows who the informant is, while never quite denying that he may have informed to the FBI.

“[Without] the informant telling the FBI where to go, who to look at,” we hear Frank Colombo say, “this case would never have been broken. Never.” He continues: “I know who broke the case. At this moment right now, I’m not sure if I feel comfortable saying who broke the case, I need to talk to some people and make sure I’m not in danger if I say who broke the case.”

Though Frank Colombo probably comes out of the episode as the prime suspect, McMillions does also subtly imply a number of other potential FBI informants.

As Frank Colombo’s interview runs, the interview cuts to a few faces we have not seen for a number of episodes, like Michael Hoover, one the first winners investigated by the FBI, and Gloria Brown, who had plenty of reasons to go to the authorities after being left with only $10,000 a year from her $1 million win. Either of these could be potential informers.

One person who will not be revealing the informant, however, is FBI agent Doug Matthews. He says in the documentary, “I will never tell you who the source was. You will never get that from me. If I was a dead body you could not get that off my corpse. That’s how much I think about the bureau’s program, it has to work like that.”

McMillions concludes on Monday, March 9 on HBO.