Scarlett Johansson aka Black Widow died in Avengers: Endgame to save Hawkeye and while it came as a shocker to both her and the fans, the director was sure that it was the right way to proceed with the storyline as there had to be a sacrifice.

Does Black Widow come back to life?

After all, she is technically dead. ... Natasha died in 2019's Endgame after sacrificing her life to secure the Soul Stone, which the Avengers needed to defeat Thanos. Now—meaning, in this new film, which is in the past—we find Black Widow on the run from authorities after helping Captain America free Bucky Barnes.

Is the Black Widow really dead?

As far as we know, Natasha Romanoff is dead.

Because the events of Black Widow are set right before Avengers: Infinity War, in this film, Natasha is alive. ... There is also a scene at the end of the film that bridges the gap between the events of Black Widow and Infinity War nicely.