John the Baptist is beheaded
At Herod Antipas's birthday banquet, the daughter of Herodias danced and pleased him so much that he promised her anything. Prompted by her mother, she asked for John the Baptist's head on a platter.
Most certainly I tell you, among those who are born of women there has not arisen anyone greater than John the Baptizer; yet he who is least in the Kingdom of Heaven is greater than he.
Matthew 11:11 (World English Bible)
Herod was grieved but would not break his oath in front of his guests. John's disciples buried his body and told Jesus. Jesus had said that no one born of women was greater than John (Matthew 11:11). Later, hearing of Jesus, a guilty Herod thought John had risen from the dead (Mark 6:16).
Ancient witnesses outside the Bible
Historical sources, not Scripture.
Dating notes
Ussher: early AD 32, shortly before the Passover of John 6:4. Josephus names the daughter Salome and says John died at Machaerus. The month shown is estimated from the order of events in Ussher's harmony, so that events of the same year appear in sequence.