Who was he, the one who killed me?

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Across
  1. 3. Smallest unit that can live on its own and that makes up living organisms
  2. 5. You eat them at Sudoku n.5
  3. 7. Clown from Stephen King's book and movie
  4. 9. Present tense of 7 across
  5. 10. Sudoku n.3 is in it
  6. 12. Short for Josephine
  7. 13. Bread spread
  8. 16. The warrior _ a weapon
  9. 18. Clean and tidy
  10. 19. Atom or molecule with a net electrical charge
  11. 21. Not off
  12. 22. Sudoku n.2
Down
  1. 1. The feeling of the optimist
  2. 2. The one who commits Sudoku n.4
  3. 4. Pronouns for Sudoku n.1
  4. 6. The king of the jungle
  5. 8. Crocodiles
  6. 9. A taking in
  7. 11. Used for bondage
  8. 14. Movie about falling in love with an AI, starring Scarlett Johansson's voice
  9. 15. Venereal infections
  10. 16. "To be" in the past
  11. 17. J'adore...
  12. 20. Operating system