John 12:33

Greek ποίῳ θανάτῳ ἔμελλεν ἀποθνῄσκειν. 

1. ποίῳ (poiō): This is an interrogative pronoun meaning "what/which/who."

2. θανάτῳ (thanatō): This is the dative masculine singular form of the noun θάνατος (thanatos), meaning "death."

3. ἔμελλεν (emellen): This is the imperfect indicative form of the verb μέλλω (mellō), meaning "to be about to."

4. ἀποθνῄσκειν (apothnēskein): This is the present infinitive form of the verb ἀποθνῄσκω (apothnēskō), meaning "to die."

The rendering "which death he was about to die" is a semantically bizarre phrase. The Greek emphasizes the pronouns so much that it is hard not to notice the intentional absence of one here. Revelation 20:14 speaks of a Death that is "cast away" as well as "death swallowed", etc.