Herod had James killed and Peter put in prison.

Acts 12:1-4

12 It was about this time that King Herod Agrippa sent soldiers [MTY] who seized and put in prison some of the leaders of the congregation in Jerusalem. He did that because he wanted to make the believers suffer. 2 He commanded a soldier to cut off the head of the apostle James, the older brother of the apostle John. 3 When Herod realized that he had pleased the leaders of the Jewish people by doing that, he commanded soldiers to arrest Peter in order to kill him, too. This happened during the festival when the Jewish people ate bread that did not have yeast. 4 After they seized Peter, they put him in prison. They arranged for four groups of soldiers to guard Peter. Each group had four soldiers. Every three hours a different group began to guard him while the others rested. Herod wanted to bring Peter out of prison and judge him in front of the Jewish people after the Passover Festival was finished. He then planned to command soldiers to execute Peter.