The Hurt Locker star first appeared as Clint Barton and his Hawkeye alter ego in the 2012 instalment, in which he spent much of the film brainwashed by Tom Hiddleston's villain Loki.

Since Hawkeye quite literally did not have a mind of his own, Renner found it extremely frustrating since he wasn't able to delve into the character's true identity.

In fact, Renner was so irritated by Loki's hold over Hawkeye that he nearly considered calling it quits while filming the first blockbuster.

During a question and answer session at London Film and Comic-Con, Renner said, "I never really told anybody this, but in the first Avengers... I was just getting to know who Hawkeye was, and then zap, I go round like a zombie, I'm like Loki's minion. And I'm still not even sure who Hawkeye was at that point. So I'm a little frustrated, because I was so excited to figure out who Hawkeye was."

Renner made his feelings clear to the producers while filming.

"I just had a heart attack in every scene - I'd just be walking with... (co-star) Scarlett Johansson, and just be like, 'Ugh'," he said, clutching his chest as if having a heart attack. "And they said, 'What are you doing man?' 'I'm giving you an option, if you just want to kick me out of this movie. Just you know, at any given moment, if you wanna kill me off, daddy's gonna be having a heart attack.'"

Eventually, Renner came around to appreciating Hawkeye, and went on to reprise the role in the subsequent follow-ups, Avengers: Age of Ultron and Captain America: Civil War.

Now, after playing the role for the past four years, the actor insists he wouldn't be faking Hawkeye's death anytime soon.

"I don't really want him to die now," Renner said. "I really got to explore him a lot, and I can't wait to explore him more, and there's some really cool ideas coming up."

Renner is slated to put his archery gear back on for Avengers: Infinity War, which is set for release in the summer of 2018.