Marcia Clark says it wasn’t her decision to have O.J. Simpson try on the infamous gloves in the 1994 murder trial of Nicole Brown Simpson.

In a new preview of Dateline’s “The People vs. O.J. Simpson: What the Jury Never Heard,” set to air on NBC Sunday, Clark tells Josh Mankiewicz that she was against the decision from the beginning.

“That was not my call. I did not want him to try on the evidence gloves. I never did,” Clark said. “I was miserable from the moment that Chris [Darden] said, ‘No, I’m doing this.’ And I never expected anything good to come of it.”

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But Clark also revealed that she wasn’t upset when she was proven right, telling Mankiewicz that at the time she told Darden, “If that lost the case for us, we were never going to win anyway.”

Clark also told Dateline that she personally takes responsible for the “physically painful” not-guilty verdict reached by the jury in the highly publicized trial.

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“I was the one trying the case,” she said. “But at the end of the day, we really– there was no way to reach that jury. There was no way to make them believe. There really wasn’t.”

“The People vs. O.J. Simpson: What the Jury Never Heard” airs Sunday, March 6 at 9/8c on NBC.