@MrGrimm888 That’s a rather complicated story, depends on who you ask. To me, the answer is that yes, they played a major part in his death.
First let’s define Pharisee:
a member of an ancient Jewish sect, distinguished by strict observance of the traditional and written law, and commonly held to have pretensions to superior sanctity.
Knowing that, read this:
The truth is that the Pharisees did hate Jesus, and He rightly isn’t known for showing them a great deal of grace. He called them out for their hypocrisy. He exposed their inner tombs. But the hatred they felt for Him wasn’t mere sour grapes at His approval rating, nor was it as principled as mere evil versus good. It was rather more craven. They hated Jesus not because He called them names, but because He threatened their security, prestige and income. He was going to ruin everything they had worked so hard for, and getting everybody killed.
The Pharisees had brokered a rather uneasy peace between the powers of Rome, and their own people. Rome, you will remember, had no great desire to remake the cultures their army had conquered. Any nation willing to submit to Rome’s military and political authority could go on about their business. Israel, however, wasn’t a nation given to separating their political and theological loyalties. Thus the rise of the Zealots, that sect who, in the spirit of the Maccabees, sought to remove Rome’s yoke. Thus the uprising in 70 AD that led to the utter destruction of Jerusalem. It was the Pharisees who kept their finger in that dyke. And they made a decent living doing it. It was Jesus, however, who kept poking at the levee.
His popularity, His talk of the kingdom, His affirmation that He was in fact the Messiah, this threatened the uneasy peace. If the people got behind Joseph’s son, Rome would awake, and start killing Jews indiscriminately, not bothering to distinguish the Pharisee party from the Jesus party. This is how Caiaphas came, in a moment of treachery, to speak a gospel truth when he said, “nor do you consider that it is expedient for us that one man should die for the people, and not that the whole nation should perish” (John 11:50). The Pharisees hated Jesus not because He made them look bad with the people, but because He made them all look bad to Rome.
https://www.ligonier.org/blog/why-did-pharisees-hate-jesus-so-much/
Matthew, the best-known gospel, describes the unfair trial of Jesus arranged and presided over by the Jewish high priest who scours the land to find anybody who would testify against Jesus. Eventually, the high priest concludes that Jesus is guilty of blasphemy and asks the Jewish council what the penalty should be. “They answered, ‘He deserves death.’ Then they spat in his face and struck him” (Matthew 26:57–68). Matthew’s description of Jesus’ suffering and death on the cross (referred to by Christians as Jesus’ “passion”) has becomes the basis for many books, plays, and musical compositions over the years, and is prominent in Christian liturgy, particularly for Easter.
All four gospels suggest either implicitly or explicitly that because the Jews were not allowed to punish other Jews who were guilty of blasphemy, they had to prevail on the reluctant Romans to kill Jesus. Pontius Pilate, the Roman governor of Judea, is described as basically sympathetic to Jesus but unable to withstand the pressure from the Jews who demanded Jesus’ execution. This idea is expressed most clearly in the gospel of John: “Pilate said, ‘Take him yourselves and judge him according to your own law.’ The Jews replied, ‘We are not permitted to put anyone to death’” (18:31).
In the most controversial verse in all the passion narratives, the assembled members of the Jewish community tell Pilate, “His blood be on us and on our children” (Matthew 27:25). This is the source for the Christian belief that later generations of Jews are also guilty of deicide, the crime of killing God.
https://www.myjewishlearning.com/article/who-killed-jesus/
This is why they are the Chosen People regardless (to many Christians):
The notion of Jews being chosen has its root in several biblical verses. One of the most prominent, Deuteronomy 7:6, says, “For you are a people consecrated to Adonai your God: of all the peoples on earth Adonai your God chose you to be God’s treasured people.” The next two verses provide the reason for this choice. God did not choose the Israelites because of their numbers; rather, God chose the Israelites and freed them from slavery because God loved them and because God had made promises to their ancestors, the biblical patriarchs: Abraham, Isaac, and Jacob.
https://www.myjewishlearning.com/article/are-the-jewish-people-chosen/