For anyone who is interested, here is a link at http://www.ccel.org/bible/phillips/CN500APOSTLES%20FATE.htm showing the deaths of the twelve apostles including John (the brother of James) who wrote the book of Revelation, the gospel of John, and the 3 letters of John.  The page shows the following information about the apostle John's death:

 

JOHN, BROTHER OF JAMES and SON OF ZEBEDEE - A FISHERMAN

 

"According to John's Gospel (19:26-27), it was probably John who took Mary, the mother of Jesus as his adopted mother. He preached in Jerusalem, and later, as bishop of Ephesus, south of Izmir in western Turkey, worked among the churches of Asia Minor. During the reigns of either Emperor Nero (AD54-68) or Domitian (AD81-96), he was banished to the nearby island of Patmos, now one of the Greek islands in the Aegean Sea. He was subsequently freed and died a natural death at Ephesus c AD100."

 

"After decades of debate, many scholars accept that the apostle John wrote the Book of Revelation, perhaps as early as c AD68-70, and that he either wrote or provided the material and theology for John's Gospel and the three Letters of John.