He IS dead and that's all there is to it. *spoiler*
Since people in other threads are saying that Ben is still alive and they just need Natalie to get him out of Jail, because why else would they need to overturn the conviction. I figured I would explain in a separate thread.
Whether you are dead or alive, a conviction is a conviction. It remains, even in death.
Overturning not only clears his name and lets the world know that he didn't do it, but it allows them to then charge Abby with the crime.
Since he was convicted, the case has been closed. Exonerating him will re-open the case so they can then go after the real killer.
The dialogue in the epilogue is clear. Ben is indeed dead, as is the case with most incarcerated child killers. So please stop clinging to the hope that Ben is out there living his days behind a set of prison bars.
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I won't keep you guessing, (formerly known as 'Ryners')