An Oklahoma man sentenced to death for a murder he says he did not commit will plead his case to the state Pardon and Parole Board in a clemency hearing Monday, less than three weeks before he’s set to be executed.An Oklahoma man sentenced to death for a murder he says he did not commit will plead his case to the state Pardon and Parole Board in a clemency hearing Monday, less than three weeks before he’s set to be executed.