I haven't checked today, but last I heard the DA's office hadn't decided whether to indict Greer. I wouldn't be surprised if they did not. That raises the question of how much discretion the DA has. I don't like the idea of making decisions whether to enforce homicide laws depend on how sympathetic the killer is.
I found a very interesting article about a series of self-defense cases the Supreme Court decided in the 1890's, all involving a federal district court judge named Isaac Parker. Parker, whose court was in Fort Smith, Arkansas, became notorious as a "hanging judge" for urging juries to be unsympathetic to claims of self-defense by defendants who had killed criminal attackers. The Court kept reversing his decisions, getting more impatient with him each time. And yet much later, Chief Justice Rehnquist wrote an article sympathetic to Parker's complaints that the justices were letting murderers go free on technicalities.
THE SELF-DEFENSE CASES: HOW THE UNITED STATES SUPREME COURT CONFRONTED A HANGING JUDGE IN THE NINETEENTH CENTURY AND TAUGHT SOME LESSONS FOR JURISPRUDENCE IN THE TWENTY-FIRST