ATLANTA — At N.F.L. media nights, the biggest stars speak at podiums, and this year was no different. When the Los Angeles Rams took the floor, quarterback Jared Goff, running back Todd Gurley II and Coach Sean McVay drew big crowds.

But cornerback Nickell Robey-Coleman drew equally large crowds. A week ago, Robey-Coleman was just a former undrafted free agent finishing his sixth season. Now, he needed media minders to keep reporters from digging too deeply into a play that may have altered the Super Bowl.

That came in the N.F.C. Championship Game in New Orleans, where he drilled Saints wide receiver Tommylee Lewis before he could get in position to catch a pass from Drew Brees.

No flag was thrown for pass interference or helmet-to-helmet contact. The Saints went on to kick a field goal, but left enough time on the clock for the Rams to tie the game and send it into overtime, when they eventually won, 26-23.

The game-changing play has been a game changer for Robey-Coleman. He said he had received numerous death threats, and his social media accounts have been overwhelmed with hate mail from angry Saints fans.

“Right now, my phone is crazy,” Robey-Coleman said. “Like my brother said, a lot of people probably had money on the game.”

Robey-Coleman said he’s received more than 3,000 direct messages on Instagram, more than 1,000 messages on Facebook and 500 messages on Snapchat.

“I got threats here and there, but nothing to dwell on,” he said. “All types of threats, death threats.”

The non-call led Saints owner Gayle Benson to say the team had been “unfairly deprived” of a chance to reach the Super Bowl. Louisiana Senator Bill Cassidy criticized the N.F.L. on the Senate floor during a government shutdown.