Before their tragic deaths in December, Rob and Michele Reiner were working diligently to see that a one-time death row inmate convicted on now-refuted evidence would be exonerated and freed after developing a bond with the man so strong that the couple planned to invite him to live in their home if he were to be freed.  Nanon Williams has been in prison in Texas for 34 years after being convicted as a juvenile offender of the 1992 murder of a Texas teenager, which he says he didn’t commit. The bond that he developed with the Reiners, who were both liberal activists on multiple social fronts, grew to the point that the famous couple considered him to be a part of their family.  “[They were] an integral part of my life,” Williams said in an interview with NBC News from W.F. Ramsey Unit, a maximum-security prison about 40 miles south of Houston, about the slain couple. “They became a part of me.” On Dec. 14, Rob and Michele were found dead inside their Brentwood home, …