Did Hawkeye Kill Quicksilver?

The Avengers: Age of Ultron: Hawkeye Kills Quicksilver in this Gag Reel Clip | ScreenSlam - YouTube.

Who killed Quicksilver?

Quicksilver getting shot and killed by Ultron After the dust settled, the bullet-ridden Pietro then took one last glance at Barton, remarking if he saw that coming before collapsing dead from his many gunshot wounds.

Why did they kill Quicksilver in Ultron?

First, his death was meant to raise the stakes of the story and show that there would be lasting consequences for Ultron's actions. Second, it subverted viewers' expectations.