How did the Apostles die? For some reference as to why this question interests me, one of the evidences that is often given for proof that Jesus really did die and was resurrected is the change wrought in his original disciples.  

Example: Key Evidence for The Resurrection of Jesus Christ -- Changed Lives of The Disciples


  Another evidence for the resurrection of Jesus is the changed lives of
  the disciples. How do you account for the fact that before the
  resurrection they were frightened men and were hiding away in fear of
  their lives? After the resurrection they preached everywhere for no
  earthly benefit -- only suffering and martyrdom. The early believers
  were beaten, stoned, thrown to the lions, tortured and crucified for
  sharing a lie -- if the resurrection had not occurred. The ultimate
  martyrdom of thousands of believers is one of the strongest proofs of
  the resurrection of Jesus Christ.


Since the argument is often used by Apologists (and is therefore of interest to me), I'd like to have it on the site as a reference to the claim.  

So, how did the Apostles die?
Judas, of course, hung himself after betraying Jesus

James is the only other Apostle whose death is recorded in Scripture, in Acts 12:1-2


  It was about this time that King Herod arrested some who belonged to
  the church, intending to persecute them. 2 He had James, the brother
  of John, put to death with the sword.


The rest of the Apostles deaths are recorded outside of Scripture, and there is some uncertainty and discrepancy.

Andrew - The details are unclear, but the Catholic Encyclopedia lists this.


  It is generally agreed that he was crucified by order of the Roman
  Governor, Aegeas or Aegeates, at Patrae in Achaia, and that he was
  bound, not nailed, to the cross, in order to prolong his sufferings.
  The cross on which he suffered is commonly held to have been the
  decussate cross, now known as St. Andrew's, though the evidence for
  this view seems to be no older than the fourteenth century. His
  martyrdom took place during the reign of Nero, on 30 November, A.D.
  60); and both the Latin and Greek Churches keep 30 November as his
  feast.


Bartholomew  - Also from the Catholic Encyclopedia


  The manner of his death, said to have occurred at Albanopolis in
  Armenia, is equally uncertain; according to some, he was beheaded,
  according to others, flayed alive and crucified, head downward, by
  order of Astyages, for having converted his brother, Polymius, King of
  Armenia. On account of this latter legend, he is often represented in
  art (e.g. in Michelangelo's Last Judgment) as flayed and holding in
  his hand his own skin. His relics are thought by some to be preserved
  in the church of St. Bartholomew-in-the-Island, at Rome. His feast is
  celebrated on 24 August. An apocryphal gospel of Bartholomew existed
  in the early ages.


James, the son of Alpheus is listed in the Orthodox Wiki with the following:


  St James finished his apostolic work in the Egyptian city of
  Ostrachina, where he was crucified by the pagans.


while Foxes Book of Martyrs says this:


  At the age of ninety-four he was beat and stoned by the Jews; and
  finally had his brains dashed out with a fuller’s club.


Peter - from the Catholic Encyclopedia:


  It is an indisputably established historical fact that St. Peter
  laboured in Rome during the last portion of his life, and there ended
  his earthly course by martyrdom. As to the duration of his Apostolic
  activity in the Roman capital, the continuity or otherwise of his
  residence there, the details and success of his labours, and the
  chronology of his arrival and death, all these questions are
  uncertain, and can be solved only on hypotheses more or less
  well-founded. The essential fact is that Peter died at Rome: this
  constitutes the historical foundation of the claim of the Bishops of
  Rome to the Apostolic Primacy of Peter.


followed by several accounts, too numerous to list here.

Thomas - from the Orthodox Wiki


  Preaching the Gospel earned the holy Apostle Thomas a martyr's death.
  For having converted the wife and son of the prefect of the Indian
  city of Meliapur (Melipur), the holy apostle was locked up in prison,
  suffered torture, and finally, pierced with five spears, he departed
  to the Lord. Part of the relics of the holy Apostle Thomas are in
  India, in Hungary and on Mt. Athos.


The Catholic Encyclopedia isn't so sure...


  On the other hand, though the tradition that St. Thomas preached in
  "India" was widely spread in both East and West and is to be found in
  such writers as Ephraem Syrus, Ambrose, Paulinus, Jerome, and, later
  Gregory of Tours and others, still it is difficult to discover any
  adequate support for the long-accepted belief that St. Thomas pushed
  his missionary journeys as far south as Mylapore, not far from Madras,
  and there suffered martyrdom.


Philip  - Not much information exists on his death. What is given is always prefaced as "rumors".  Some accounts say hostile Jews had him tortured and then crucified upside down. Some sources have him being stoned.  The honest answer is "we just don't know".

Simon - From the Catholic Encyclopedia:


  The Abyssinians accordingly relate that he suffered crucifixion as the
  Bishop of Jerusalem, after he had preached the Gospel in Samaria.
  Where he actually preached the Gospel is uncertain. Almost all the
  lands of the then known world, even as far as Britain, have been
  mentioned; according to the Greeks, he preached on the Black Sea, in
  Egypt, Northern Africa, and Britain, while, according to the Latin
  "Passio Simonis et Judae" — the author of which was (Lipsius
  maintains) sufficiently familiar with the history of the Parthian
  Empire in the first century — Simon laboured in Persia, and was there
  martyred at Suanir. However, Suanir is probably to be sought in
  Colchis. According to Moses of Chorene, Simon met his death in
  Weriosphora in Iberia; according to the Georgians, he preached in
  Colchis. His place of burial is unknown.


Judas Thaddeus - From the orthodox Wiki:


  He was one of the Twelve Apostles (not to be confused with the
  Thaddeus of the Seventy Apostles) and after the Ascension he preached
  the Gospel in Judea, Samaria, Galilee, Idumea, Syria, Arabia,
  Mesopotamia, and Armenia. While preaching in the area around Ararat he
  was captured by pagans, crucified and killed by being shot with
  arrows.


John was spared a violent death.

Matthias was sentenced to death and stoned.

Paul According to the Orthodox Wiki, Paul was martyred with the Apostle Peter under Nero by beheading.