An affirmative defense is strong evidence that someone else committed the murder - motive, opportunity, fingerprints on the gun that delivered the coupe de grace - they pinned it on my client and the police didn't do a proper investigation because they are corrupt and lazy even though they had all the evidence before charging my client.
Actually, thats not an affirmative defense. An affirmative defense is I did it, but it was legal. Self defense is an example of an affirmative defense.
And..the victim is still alive, and doing well, in good health!