Death by Romans
When the Jewish leaders turned Jesus over to the Roman governor, he told them to judge Jesus for themselves,
“Then Pilate said to them, ‘You take Him and judge Him according to your law.’ Therefore the Jews said to him, ‘It is not lawful for us to put anyone to death,’ that the saying of Jesus might be fulfilled which He spoke, signifying by what death He would die” (John 18:31-32).
Three times in John’s Gospel Account, Jesus alluded to the manner of His death (John 3:14; 8:28; 12:32, 33), that He would be lifted up, indicating crucifixion.
Thus, when the Jews insisted on Pilate handling the matter, this meant that ultimately Jesus would experience crucifixion, because to perform it, the executors would nail Him to a cross while it was on the ground, and then they would lift it upright, hence lift Him up and He would die.