Even though i think the death should be looked at again, you re making a assumption that is wrong.
You saw a program where some families had closure but what the fuck does that even mean?
I had none when my partner died in an accident, everyone said after the funeral there is closure no there isn't.
Many years ago, my friends son was killed in a violent attack, 2 youths were jailed for around 14 years each.
The parents never wanted the death penalty, they just hoped the youths would turn their lives around.
There is no "closure" the lad will never walk back into their lives again.