When did Judas Iscariot kill himself? Matthew 27 NIV


  Judas Hangs Himself
  
  1 Early in the morning, all the chief priests and the elders of the people made their plans how to have Jesus executed. 2 So they bound him, led him away and handed him over to Pilate the governor.
  3 When Judas, who had betrayed him, saw that Jesus was condemned, he was seized with remorse and returned the thirty pieces of silver to the chief priests and the elders. 4 “I have sinned,” he said, “for I have betrayed innocent blood.”
  “What is that to us?” they replied. “That’s your responsibility.”
  5 So Judas threw the money into the temple and left. Then he went away and hanged himself.
  6 The chief priests picked up the coins and said, “It is against the law to put this into the treasury, since it is blood money.” 7 So they decided to use the money to buy the potter’s field as a burial place for foreigners. 8 That is why it has been called the Field of Blood to this day. 9 Then what was spoken by Jeremiah the prophet was fulfilled: “They took the thirty pieces of silver, the price set on him by the people of Israel, 10 and they used them to buy the potter’s field, as the Lord commanded me.”[a]
  
  Jesus Before Pilate
  
  11 Meanwhile Jesus stood before the governor, and the governor asked him, “Are you the king of the Jews?”


One is naturally inclined to believe that Judas killed himself just prior to the Lord's crucifixion, going by this text.

In 1 Corinthians 15:3-8, Paul states the following:


  3 For what I received I passed on to you as of first importancea : that Christ died for our sins according to the Scriptures, 4 that he was buried, that he was raised on the third day according to the Scriptures, 5 and that he appeared to Cephas, and then to the Twelve. 6 After that, he appeared to more than five hundred of the brothers and sisters at the same time, most of whom are still living, though some have fallen asleep. 7 Then he appeared to James, then to all the apostles, 8and last of all he appeared to me also, as to one abnormally born.


(Note: "the Twelve" is not capitalized in every translation)

Thus, we see that Paul is saying that Jesus appeared to the twelve after His resurrection. But that cannot be, as Matthew, as shown above, indicates or insinuates that Judas killed himself prior to the crucifixion; therefore, being a witness to the risen Christ would be an impossibility.

So, was Judas still part of the group when Jesus began to appear publicly following His resurrection or not? Did he die before or after the crucifixion/death/resurrection or some other time?
Matthew 27:3 says that the impetus for Judas' suicide was seeing him be condemned, rather than seeing him being executed or anything else. Jesus' interactions with Pilate, including the possibility of his being freed, are narrated afterwards. Although the gospels do jump forwards and back in time, I take the explicit description of Judas' remorse being because Jesus was condemned as a clear indication that he killed himself before Jesus was executed.

1 Corinthians 15:5 uses the phrase "The Twelve" which was a title for the twelve apostles, and the title was used somewhat regardless of how many of them were still alive. We can see this most clearly by reading the very previous phrase!

While Judas may have been replaced by Matthias, Peter never was, and so although he is distinguished from the other twelve apostles in 1 Corinthians 15:5, that doesn't stop Paul from using the natural title The Twelve for the others.