Caitlin died in the third season after she'd been impaled by a middle bar. Julian then took off the necklace she had and she came back to life, only not as Caitlin, but as the villainous Killer Frost. That proves that sometimes it's a good thing to be a villain in the Arrowverse.

Who killed Caitlin in flash?

In the second half of The Flash season 3, Caitlin eventually got consumed by the Killer Frost persona, who served Savitar. In the twentieth episode, "I Know Who You Are," Killer Frost tried to murder Tracy Brand, who became a temporary member of Team Flash.

What episode does Caitlin Snow die?

"Killer Frost" is the seventh episode of the third season of The CW television series The Flash.