'Murder to Mercy: The Cyntoia Brown Story' debuts on April 29.
The boy's mother expressed concerns for his safety.
“I'm so much more than the worst thing that I've done.”
It's unclear when the couple tied the knot.
At 16, Brown began a life sentence at the Tennessee Prison for Women.
'Free Cyntoia' is due out this fall.
Cyntoia Brown, who served 15 years of a life sentence, will be released from prison.
Brown's prison release will be featured in the film.