How did St. John the Apostle die?

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Mark’s Gospel hints of John’s martyrdom, but his death as a martyr is unknown. The theologian Tertullian reported that John was plunged into boiling oil but miraculously escaped unscathed. In the original apocryphal Acts of John, the apostle dies; however, later traditions assume that he ascended to heaven. Officially, the apostle’s grave is at Ephesus.