but the statute of limitations has run out
I've always been conflicted on the issue of a statute of limitations.
On the one hand the imposition of punishment long after (no, I don't have a working definition of "long") the crime was committed seems more related to revenge than anything else.
On the other hand, merely not getting caught within x years should not be a free pass regarding the committing of a crime.
On the third hand, there are some (admittedly I know of barely a handful of cases) who comport themselves as "model citizens" after having committed some henious crime they were not caught for. Not only do they live the rest of their life without commiting as much as a speeding infraction, they make significant positive contributions to society. Should their one indiscretion years earlier ruin their life at this later point?
In Virginia there are no statutes of limitations on felonies. I have participated in the admissions processing of three (IIRC - could be 4) folks who were eventually caught, prosecuted and sentenced to prison. In all three cases a referral was made to the Governor for a conditional pardon based on a multiplicity of factors, but always including the inmates current age as compared to their age when the crime was committed, their (lack of a) criminal record since the crime, and any positive accomplishments (even that they had raised a child/ren who were not criminals). In one case, which involved both an escape from prison (a road camp - look it up under Virginia prisons history) and a robbery of a country store, the decision was that the guy (then 87 years old) must serve a full year before being released as that was the statutory minimum sentence. He was locked up for 61 days when his case was heard by the Parole Board, who released him on Home Electronic Monitoring (ankle bracelet).
Now, since there is no information about the 3 guys in Texas who are getting off scott free, I have no thoughts. As for whether or not Michael Anthony Green should be compensated by Texas, or sue them if they do not offer compensation, for his erroneous conviction and inprisonment - I just don't know. Sure it sucks to lose that large a slice of your life, but if there is some sort of way to prove the prosecution was not malicious ....
stay safe.