What did John the Baptist's death foreshadow?

If John the Baptist had died before Jesus and in somewhat similar circumstances, it could be said that his death foreshadowed the death of Jesus. However, the first-century Jewish historian, Josephus says that John the Baptist was imprisoned in the castle at Macherus, east of the Dead Sea, and executed there for publicly criticising Herod Antipas' marriage to his brother's former wife. The marriage took place in 34 CE and John must have been executed in 35 or 36 CE. The manner and even reason for his death differ from the crucifixion of Jesus, who is traditionally believed to have died in either 30 CE or 33 CE.

There is nothing relevant that John's death could really be said to have foreshadowed.