What motive did the knights have for killing Thomas Becket?

The knights who killed Thomas Becket were motivated by a conflict between King Henry II of England and Becket, who was the Archbishop of Canterbury. Becket resisted the king's attempts to control the church and opposed the king's legal reforms, which would have reduced the power and privileges of the clergy. The knights were loyal to the king and acted on his behalf to remove Becket from power and eliminate his opposition to the king's policies.