An FBI translator who traveled to Syria in 2014 to investigate an ISIS militant has gone rogue and married the terrorist, CNN reported.

Daniela Greene has reportedly lied to the FBI about where she was headed and warned her new husband that he was under investigation.

Greene married to no ordinary terrorist. He was Denis Cuspert, a German rapper who joined ISIS.

Cuspert has become very a very influential online recruiter for the militant group. This has caused him to be put on the radar of counter-terrorism authorities on two continents.

He is known as Abu Talha al-Almani in Syria. Cuspert has praised Osama bin Laden in a song and threatened the former U.S. President Barack Obama with a throat-cutting gesture.

He has also appeared in the terrorist group’s propaganda videos, including one during which he was holding a freshly severed human head.

ISIS emerged in Syria and Iraq back in 2014, when the terrorist group was able to fill the power vacuum created by U.S. invasion of Iraq and also funding of militants groups in Syria.

The terrorist group launched an active recruitment in the internet which has managed to recruit thousands of people from across the world, many whom were from European countries.