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I just Googled the following information, and cannot verify it, but this might give you something further to search if you're interested.
How did apostle John die?
Questions? -
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QUESTION: How did the apostle John die? When was his death? Did he die in Asia Minor?
ANSWER: The Bible is silent regarding when or how the apostle John died. Information regarding his last days comes to us primarily from tradition. The 1913 Catholic Encyclopedia, in an article on St. John the Evangelist, states that writers in the second and third centuries A.D. accepted a widely held tradition that the apostle spent his last days in Ephesus.
According to the Catholics, Justin Martyr also referred to John as an apostle of Jesus who lived in Ephesus. St. Irenaes, Eusebius and still others, again according to the Catholic Encyclopedia, all agree that John left the isle of Patmos where he was banished for preaching the gospel (see Revelation 1:9). The last living apostle then spent his remaining days in Ephesus until he died somewhere around the close of the first century.
A well-known reference book on New Testament Martyrs, written by John Foxe (1515 - 1587), states that the apostle, as punishment for being a believer in Christ, was thrown into a cauldron of boiling oil.
In Christ Jesus.