When the lady detective told him TM was dead - or - when he touched TM's body by pulling TM's body away from his body?
Lady detective indicated GZ seemed surprised and dejected at the news that TM was dead, and said his faith said not to kill.
But, when he was handling TM at the scene, didn't he realize he was dead?
He shot Martin, got out from underneath Martin, Martin said “You got me” and Z started holding his arms. Martin at that time was saying stuff Z can’t remember, and things like “Ow”.
Then one of the witnesses came with a flashlight, and Z thought it was a cop (he had been waiting for several minutes for the cops to come). So he got up off of Martin. IIRC he then asked the witness to help hold Martin down, but then a real cop came.
That is when Z (who had holstered his gun prior to holding Martin’s arms) put his hands on his head and told the cop where his gun was located. So I imagine Z was focused on the cop’s instructions.
At some point in those few seconds/minutes Martin probably clutched his chest wound and died.
The paramedics/cops? came and started CPR on Martin (probably already dead as no pulse). But the last thing Z saw was probably the guys doing CPR.
I think Martin’s awareness of the serious nature of the situation was when he said “You got me.” Prior to that it was just a beat-down of a “cracker” - worthy of a video post to share on the internet.
Zimmerman’s awareness probably came when the cop told him Martin was dead, with his “killing is wrong” statement. Before that it was just another checking out some suspicious punk. Something that I have done several times in our neighborhood.