Second-degree murder is defined as an intentional killing that was not premeditated. In some states, second-degree murder also encompasses depraved heart murder, which is a killing caused by a reckless disregard for human life.
However, I think manslaughter is probably the more apt charge in this case. Not excusing his actions, but I think it is a tragic accident committed by a relatively new cop who blew it badly.
Manslaughter - the crime of killing a human being without malice aforethought, or otherwise in circumstances not amounting to murder.
It's a sad situation all around.
He could have been planning on shooting her for 20 years or he could have been thinking of shooting her for 1/20th of a second.
It makes no difference.
Please stop. There is no such thing as second degree murder in Texas. Every one on here giving advice about what it is or isnt is ignorant of Texas law.