One of the conditions was that he would provide proof of life of the captives.
In 2010, Levinson's captors sent a "proof of life" videotape and photographs of him to his family.
Proof of Life, which ends with a bullet-riddled rescue, would have been a boring film had Ackerman ever arrived on the scene.
In the movie Proof of Life, loosely based on real events and released in 2000, Meg Ryan's character has some harrowing decisions to make.
In a so-called "proof of life" video released last year but apparently made two years ago, Levinson appears about 50 to 60 pounds lighter.
The last proof of life sent by his kidnappers was a video handed over in March, but it is not known when the film was made.
"Let me reiterate, until we have PROOF OF LIFE, we cannot celebrate these rumors and sightings, " she wrote on a Facebook page set up to facilitate a search for the couple.
"We haven't had any proof of life, we haven't had any usage of his bank cards or his telephone so we are fearing the worst, but hoping for the best, " he said on Thursday.
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He appeared in several proof-of-life videos posted by the militants as negotiations for his release dragged on.
Christine has sent several emails to the address where the proof-of-life video came from to ask the senders what they want.
Chavez has neither been seen nor heard from, except for "proof-of-life" photos released in mid-February, since submitting to a fourth round of surgery in Cuba on Dec. 11 for an unspecified cancer in the pelvic area.
In 1868, John Stuart Mill made one of the most eloquent defenses of capital punishment, arguing that executing a murderer did not display a wanton disregard for life but, rather, proof of its value.
But other doctors, especially oncologists used to the rigorous standards of proof required for big drug trials, note a lack of controlled trial data showing that the procedure extends life.
Say what you will about traditional media and the continually shrinking size of print magazines, but we've got some proof right here that good 'ol pulp still has a lot of life left.
Having spent most of his life in Buenos Aires, Pope Francis has given proof that he can rise above his environment.
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According to Bosse, there is scant proof that egg-to-smolt survival, which occurs during the first year of life, has decreased since the four lower Snake River dams were constructed.
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