The Catechism in Questions & Answers

394. What is recorded about the end of the early Apostles?

There are only a few vague references to this in Holy Scripture. From extra-biblical texts we learn that many Apostles died a martyr’s death. Apostle John was likely the one who lived and was active the longest of all the Apostles. After the destruction of the temple of Jerusalem (in the year AD 70) he stayed in Asia Minor and worked predominantly in the congregation of Ephesus.

The term ‘martyr’ is derived from the Greek word martys, which means “witness”. Individuals who suffer or even endure a violent death for the sake of their faith are described as “martyrs”. An example of this is Deacon Stephen, who was stoned to death for professing Jesus Christ. The events surrounding his stoning are related in Acts 7.