According to another story posted here last night, he saw that she was struggling and dying and he wanted to put her out of her misery.
Ah, so it was a tender and compassionate mercy killing.
After all, he is a board-certified trauma surgeon, and he knew for a fact that calling 911 would do no good, so he was entitled to play God.
He was so thoughtful wasn't he??? especially since he was the one who put her in that misery with his excess shots.
And he didn't want to bother the police on Thanksgiving either. Thinking of others to the dying end.