It would be either "pardoned" or "paroled".
This is a sentence. A prisoner has to serve the sentence the judge gives him.
A person who is released from prison is commonly referred to as an ex-convict, formerly incarcerated individual, or simply, a released prisoner.
The Spanish Prisoner was released on 04/03/1998.
The Prisoner of Zenda was released on 05/25/1979.
After the deaths of his erstwhile cellmates, the surviving prisoner was finally released. I found that my erstwhile partner had been embezzling from our business.
The prison demanded a USD$300 bail for the release of the prisoner.
you call the prison
Natural life sentence is when the prisoner stays in prison for a life time.
Cpt. John Price was kept prisoner in The Gulag.
The prisoner was pleading for his life.
Barabbas
"Confine the prisoner", said the judge.