During a screening of Avengers: Infinity War on Wednesday night, the directors of the film – the Russo brothers – confirmed that Loki did in fact die in Infinity War.
Peter Sciretta from Slash Film tweeted updates from a live Q&A after the screening.
“The Russo’s were asked about a fan theory that Bruce Banner is really Loki in disguise. They answered. That ‘Loki is dead,'” Sciretta tweeted.
Source: IGN.com Avengers: Infinity War Director Confirms Loki Is Really Dead