Black Widow could be alive in the Marvel Cinematic Universe, and not dead, as had recently been accepted. As per another hypothesis doing the rounds on the web, it is being suggested that the character that died in Avengers: Endgame wasn’t Natasha Romanoff, but her ‘sister’, Yelena Belova. Yelena will be introduced into the MCU for the first time in the upcoming solo Black Widow movie.
The events of Black Widow take place between the events of Captain America: The Winter Solder and Captain America: Civil War, thereby making the film a prequel of sorts. Natasha was killed off in Avengers: Endgame, along with Robert Downey Jr’s Tony Stark.
It has been supposed that Stark may likewise show up in Black Widow. The film was scheduled for release in April, but was pushed back indefinitely because of the coronavirus pandemic.