The star's character Natasha Romanoff died in "Avengers: Endgame" after sacrificing herself on Vormir to help Clint Barton/Hawkeye obtain the Soul Stone.
"Black Widow" is set before "Endgame" but after "Captain America: Civil War", and the actress hopes her new film brings fans "some resolution."
Scarlett tells Total Film magazine, "Our goal was for them to feel satisfied with this story. That they could maybe have some resolution, I think, with this character's death, in a way. It felt like people wanted that."
Scarlett is set to pass the baton to Florence Pugh, who portrays Yelena Belova, in the upcoming movie. "We realized that the audience would expect an origin story so, of course, we went in the opposite direction," director Cate Shortland confirmed to Empire last July. "And we didn't know how great Florence Pugh would be. We knew she would be great, but we didn't know how great."
She added of how Scarlett handled her character's retirement, "Scarlett is so gracious, like, 'Oh, I'm handing her the baton.' So it's going to propel another female story line."
"Black Widow", also starring Rachel Weisz and David Harbour, arrives in cinemas and on Disney+ on July 9. And Cate previously likened shooting the Marvel film to "being in the army," as its two lead stars were both ill whilst they were making it.
"It was like being in the army," she sighed. "By the end, Scarlett and her co-star Florence Pugh were both shooting while ill with pneumonia."