The Catechism in Questions & Answers

172. Where did Jesus’ suffering end?

Jesus was nailed to the cross on Golgotha. Two criminals were crucified along with Him. The cross of Jesus stood between theirs. Here the words of Isaiah 53: 12, namely that the Lord would be numbered with the transgressors, were fulfilled. In other words, He was treated like a criminal. The heavy sufferings of Jesus ultimately led to a cruel death struggle before He finally died, hours later.

Crucifixion was a mode of execution commonly practised in antiquity, by way of which the condemned would intentionally die a slow and tortured death. For this he was either bound or nailed to an upright post, with or without a cross beam.