The family of a retired FBI agent thought to have been kidnapped in Iran in 2007 has released a hostage video showing him to be alive.

In the the 54-second video released Friday, an exhausted-looking Robert Levinson is seen in a makeshift cell pleading for the U.S. government to “answer the requests” of the unspecified group that he says has been holding him.

Levinson said that he has been treated well by his captors, but that he was “not in very good” health and was running out of diabetes medication.

Levinson's family says they received the hostage video in November 2010.

On a website dedicated to his release , his son and wife urged his captors to contact them with their demands.

In March, U.S. Secretary of State Hillary Clinton said Levinson was likely being held somehwere in southwest Asia. She called on Iran to undertake “humanitarian efforts” to help bring him home safely.

Iranian officials have denied knowledge of Levinson's whereabouts, but they also have offered their help in the investigation.

Levinson, who had retired from the FBI and was a private investigator. He was on a business trip in 2007 to Kish Island. His family has said he was investigating cigarette smuggling there.