Who Kills Eren?

Eren Yeager, the anti-hero unfortunately dies at the end of the Attack on Titan manga. In chapter 138, he dies an ironic death after getting beheaded by Mikasa Ackerman at the climax of the Paradis War arc. He decides to become the villain to achieve the greater goal (freedom and a world free from Titans).

Who killed Eren Jaeger?

Eren once again proves to be the better fighter between the two, but Armin manages to immobilize him long enough for Mikasa to enter his Titan's mouth. Mikasa kills Eren by swinging her sword at his throat, decapitating him and ending his reign of terror for good.

Does Eren get killed by Mikasa?

Torn between her loyalty to her people and her love for Eren, Mikasa ultimately does kill Eren in order to stop him from killing the Marleyans and committing genocide. It was a heartbreaking moment, but a moment that Eren ultimately predicted and even forced upon Mikasa, whose emotions towards Eren never faded.