In Avengers: Endgame, the dynamic duo team up once again to retrieve the Soul Stone, with the cost unknown to them. Once Red Skull explains that one of them will have to sacrifice their life in order to complete their mission, the two compete to keep the other alive. Black Widow ends up with the short stick when she falls off the cliff and shares the same fate as Gamora did in Infinity War.
Article source: https://www.cinemablend.com/news/2474236/avengers-endgames-jeremy-renner-shares-set-photo-from-that-black-widow-scene