Robert Levinson, a former FBI special agent and undercover CIA asset, has died while in captivity in Iran, according to a statement by his family.

Levinson’s story is complicated, to say the least. The former FBI special agent retired from the Bureau in 1998. He then proceeded to work as a private investigator. In 2007, he went missing on the Iranian island of Kish.

His family has stated that he was working as an undercover CIA asset. Reports support that claim and also add that Levinson was part of a rogue CIA operation when he was captured by Iranian counterintelligence officers.

Levinson had the unfortunate fate of becoming the longest-held hostage in American history. The last proof of life that the family had received was almost 10 years ago.