I think Nel made valid points regarding the above, and I think OP realized how implausible his version is, so he took it upon himself to insist that he didn't mean to shoot - claiming he fired accidentally.
Did anyone get a look at Roux when OP made that claim? I'd be willing to bet that Roux was wishing he could have jumped up and told his client to STFU.
I agree, but I don't think that OP changed the defense on his own. He's not that smart.
It was obvious that any reasonable person watching OP testify could see he was lying and making **** up as he went. Remember, in a case of prima facie murder, the burden of proof shifts to the defendant to prove that the killing of the victim wasn't a violation of the murder laws.
OP's entire story was proven false during his cross examination. The only way it's not false is if they could prove the police moved things. Roux didn't challenge the position of the items in cross-examination of the police so they're stuck with the photos showing OP's story is a lie.
The only option left was to abandon the self-defense argument. Clearly, the prima facie case itself was not self-defense considering OP pursued what he alleges was a perceived threat.
Once the self-defense argument was abandoned, the only thing left is the gun went off on it's own.
As ridiculous as it sounds, there's nothing else left for OP. He's guilty, he was caught red-handed moments after he killed his girlfriend in cold blood.
All he histrionics and blubbering aside, he's a killer of an innocent woman who did nothing to deserve to die that night.