Judas was one of Jesus' twelve disciples and was responsible for the funds for the group.  When Jesus arrived in Jerusalem at the end of his ministry, Judas went to the chief priests and offered to betray Jesus for 30 pieces of silver. He led a crowd to Gethsemane, and identified Jesus with a kiss, thereby delivering Jesus into their hands. After Jesus was condemned to death, Judas regretted his act, threw the pieces of silver down in the Temple, and went and hanged himself.  Another account says that Judas fell and burst open (Acts 1:18).

Matt 26:14-16 - The plot
Matt 26:47-56 - The betrayal
Matt 27:3-10 - The suicide

Judas betrayed Jesus with a kiss