The former West Wing star met with Jon-Adrian Velazquez on Monday morning (05Dec11), shortly before staging a press conference to plead with officials to take another look at his case.
Velazquez was imprisoned in 1999 after being convicted of killing a retired police officer. He has always maintained his innocence and Sheen believes him.
The actor says, "The case cries out for justice."
Velazquez appears to have a good case for appeal - his lawyers claim two key eyewitnesses have since recanted their identifications of him.
His defence team has asked the Manhattan District Attorney’s office to re-investigate the murder.