However, he did not need to kill her at all, as it turned out.
According to his own statement, his initial center mass shot wounded and incapacitated her.
Not satisfied with eliminating the threat, he then chose to shoot her some more with a different weapon, and then he chose to execute her in cold blood some time after that.
If he had done the right thing, she might be in a prison hospital right now.
But because he chose evil, we will never know.
This is certain: her last moments on earth were a living hell. She was a human being. Someone's daughter.
No. If SHE had done the right thing, she'd never have broken into his house with a lead pipe in the first place.
She is the instigator, anything that happened to her after that is her own damn fault.