kill off

/K IH1 L AO1 F/
verb
  1. 1

    (transitive) To eliminate, or make extinct.

  2. 2

    (figurative, transitive) To put an end to.

  3. 3

    (film, television, literature) Of writers or producers, to permanently take a character out of a television series or other work by purposefully and deliberately having them killed within the plot.