Herb Stempel, the contestant on NBC's 'Twenty-One' who helped expose the rigged television quiz shows of the 1950s after he was "beaten" by Charles Van Doren, has died. He was 93.

Herb Stempel, the whistleblower portrayed in 'Quiz Show,' dies at 93 As a contestant on NBC's Twenty-One in 1956, Stempel went public with the revelation that he was given the answers to questions.

Herb Stempel, who had been scripted to lose on the show “Twenty-One,” testified at a congressional hearing in 1959 investigating the rigging of TV quiz shows. Bettmann Archive, via Getty Images ...

Herb Stempel, who blew the lid off fraud in the earliest version of reality TV – the quiz show – has died. He was 93. In this October 1959 file photo, Herbert Stempel appears as a witne… ...

Stempel, who obviously had learned a thing about show business over the years, was willing to give Turturro a pass, but his wife wasn't as forgiving. "She said, 'Step aside, Herb,'" he recalled.

In the isolation booth, Herb Stempel bit his lip to show tension. He dabbed sweat from his brow and sighed into the microphone. And as 50 million viewers hung in suspense, he seemed to agonize over… ...