(CNN) "Avengers" fans are throwing a penalty flag on NFL running back LeSean McCoy.

On the official release day of the highly anticipated "Avengers: Endgame," the Buffalo Bills star posted his reaction to what's arguably the movie's biggest scene. (Don't worry, we're not going to spoil it for you.)

LeSean McCoy with the Buffalo Bills.

In several tweets and an Instagram post, McCoy expressed his displeasure with the death of a character in the movie. "I'm done with Avengers," he said in a video.

In revealing this key plot point to his 700,000 Twitter followers, the NFL player apparently missed a plea by Marvel and the film's directors, brothers Anthony and Joseph Russo, who urged moviegoers not to ruin "Endgame" for those who haven't seen it yet.

"This is it. This is the end," the Russos said in a letter before the movie's release Friday. "The end of an unprecedented narrative mosaic spanning eleven years and eleven franchises.