but the murder charge is still appropriate. If she was unarmed, I'd say it was Capital Murder
Capital murder is intentionally reserved for egregious cases, not just killing someone. If you continue to escalate every murder to Capital murder because of the emotions involved and not the intent of the perpetrator then you will increase the likelihood of bad behaviors. This is one reason why we don't have death penalty for rape for instance.
This cop is a moron and should absolutely go to jail. He should be charged with murder.
The death penalty should not be on the table for him. Nor can I justify a life sentence without parole. With that I can't see charging him with capital murder, which would bring those two options on the table.
He obviously didn't go there to kill homeowner. He did however do everything wrong and intend to kill the person that he was shooting. With that he meets the definition of murder in Texas.