The stakes had been raised in Avengers: Infinity War, as audiences expected major losses and the film more than delivered. One of the first casualties was Heimdall, who fought until his last breath to give the Avengers and the world a fighting chance against Thanos and his Black Order. As punishment, Thanos stabbed the Asgardian in the heart before destroying the ship carrying the remaining Asgardian refugees.
It would seem that Heimdall's fate had a certain finality about it, but actor Idris Elba isn't entirely convinced. In an interview with KTSA, Elba discussed a potential return to the Marvel Cinematic Universe, presumably in the upcoming fourth installment in the series, Thor: Love and Thunder. "Heimdall is essentially part of the god family," he said. "So you know, he essentially could be alive. I’m just saying! I’m just putting it out there!"
He's not wrong, Heimdall has been through a lot throughout his few appearances, including a war against the Dark Elves, guiding the Asgardians from Hela and being frozen by Frost Giants.
"The Heimdall character goes way back into, you know, the Thor mythology…" Elba added. "And I'm sure there will be an interesting way to bring that alive."
There are clear plans to bring Vision back for the upcoming Disney+ series Wandavision, although whether that entails an actual resurrection remains unclear. All the same, if Vision can come back after having his mind ripped out, it seems plausible that Heimdall could return from his intergalactic grave.