Not likely. Texas’ time to execution is down to 10 years and falling. Not as good as could be hoped, but certainly no 20-40 years.
The WH, the Pope, CAIR and every goo-goo lefty in Texas will argue the shooting was self defense, justifiable homicide, i.e. ‘he didn’t want to wind up like Brown’, and he should be released for time served.
So yeah, he should be put against a wall and shot, but instead he’ll walk in a few years, prolly far less than twenty.