"Anouar Bayoudh arrived in Tunis at 00:30 AM (0050 IST) with his girlfriend. They were taken to the investigation unit for terrorist crimes at the National Guard," prosecution spokesman Sofiene Sliti said.
Bayoudh was to appear before a magistrate later today and both he and his girlfriend were to be charged with "joining a terrorist organisation and involvement in terrorist crimes", Sliti said.
The 26-year-old has no idea that his father Fathi was buried yesterday after he was among the 44 people killed in a gun and bomb attack at Istanbul's Ataturk airport earlier this week, the spokesman added.
But Anouar had a change of heart after he realised the jihadists were "monsters", his mother has told AFP.
The young man turned himself in to the rebel Free Syrian Army after realising that he no longer wanted to be part of IS, and was detained in Turkey.
His father was waiting for his wife at the Istanbul airport on Tuesday when the attackers struck, after months of back-and-forth to Turkey to try to find his son.
Tunisia has also been the victim of attacks claimed by IS, and it is thought that thousands of Tunisians have travelled to neighbouring Libya, Iraq or Syria to join IS or its jihadist rival Al-Qaeda.
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