This is after Secretary of State Hillary Clinton said in March 2011 that the agent, Robert Levinson, was in South Asia somewhere, possibly being held by terrorists. As the AP reports today:

Two years later, with the investigation stalled, the consensus now among some U.S. officials involved in the case is that despite years of denials, Iran's intelligence service was almost certainly behind the 54-second video and five photographs of Levinson that were emailed anonymously to his family. The tradecraft used to send those items was too good, indicating professional spies were behind them...

According to Gawker:

Levinson's family released the photos to the AP now because his wife believes that the government could be doing more to find her husband...

This post has been updated since it was first published.