Did Judas Iscariot commit sin by betraying Jesus Christ and did he die in Sin?

Answer 1

Yes he did sin, and he went and hanged himself.

The scriptures don't tell us if he repented of his sin. But it seems as though he might have:

Mat 27:3 Then Judas, His betrayer, seeing that He had been condemned, was remorseful and brought back the thirty pieces of silver to the chief priests and elders,

Mat 27:4 saying, "I have sinned by betraying innocent blood." And they said, "What is that to us? You see to it!"

Mat 27:5 Then he threw down the pieces of silver in the temple and departed, and went and hanged himself.