Question: What happened to Jonah after Nineveh?

The prophet Jonah was sent by God to preach to the city of Nineveh and call it to repentance. Jonah did not like the city of Nineveh because it was a rival to Israel, and fled to a boat sailing on the Mediteranean Sea. God raised a storm, and to calm that storm, the prophet told the sailors to throw him into the sea. God had also prepared a great fish that swallowed Jonah. In the fish's belly Jonah himself repented of disobedience, and asked for God's help. God had the fish spew Jonah out on dry land, and Jonah then went and preached to Nineveh. The people of the city repented and received God's mercy. When the book of Jonah closes in chapter four, Jonah is speaking with God outside the city of Nineveh.

This is the last reference to Jonah while he was alive. The Bible does not tell us what happened to him, or what he did after these events. Jesus, in the New Testament referred to Jonah in Mt. 12:39-41; and Lk. 11:29-32. Beyond this we just do not know what happened to Jonah.  Thank you for your question.