Judy Gross says she doesn't know how much longer her husband can make it. But she's scared it won't be long. 

"Alan is resolved that he will not endure another year imprisoned in Cuba, and I am afraid that we are at the end," she said in a statement released Wednesday. 

Her comments come on the five-year anniversary of the day when Cuban authorities arrested her husband, Alan Gross, who'd been working as a subcontractor the U.S. Agency for International Development. 

Alan Gross, 65, is serving a 15-year sentence for bringing satellite communications equipment to Cuba as part of his work as a State Department subcontractor. He was convicted in March 2011. 

"After five years of literally wasting away, Alan is done," Judy Gross said. "It is time for President Obama to bring Alan back to the United States now; otherwise it will be too late." 

The Cuban government has called for a prisoner swap: Gross for three imprisoned Cuban intelligence agents serving lengthy federal prison sentences in the United States. 

But the U.S. State Department has nixed that idea, saying Gross was an aid worker merely trying to help Cuba's small Jewish community get online despite Cuban government restrictions on Internet access. 

Frustrated by the diplomatic impasse, Gross has threatened to kill himself if he isn't freed soon. 

In July, he said goodbye to his wife and daughter and has refused to see them again while he's imprisoned. 

He's also refused to meet with U.S. diplomats in Havana in protest over the slow progress to free him. 
How long has he been stuck there?
Her comments come on the five-year anniversary of the day when Cuban authorities arrested her husband,