postmortem

/P OW0 S T M AO1 R T EH0 M/
noun
  1. 1

    An investigation of a corpse to determine the cause of death.

  2. 2

    Any investigation after the conclusion of an activity, particularly when said activity produces an unwanted outcome.

Source: https://en.wiktionary.org/wiki/post%20mortem, https://en.wiktionary.org/wiki/postmortem