Miles' attorney has entered a plea of not guilty.
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Miles is accused of killing Deputy Goforth in northwest Harris County in August 2015. Investigators say Deputy Goforth had worked an accident scene at around 8:30 p.m., then went to a gas station on Telge and West Road.
PHOTOS: Remembering Darren Goforth
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As Goforth was pumping gas, detectives say Miles approached Goforth from behind, said nothing and fired multiple shots. Once Goforth fell to the ground, authorities say Miles fired more shots at the deputy.
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Goforth was pronounced dead at the scene.
In early 2016, Miles was transferred to North Texas State Hospital in Vernon, the only place in Texas where violent accused criminals get treatment designed to restore their competency to stand trial. In September, a judge ruled that Miles was competent enough to return to Harris County.
VIDEO: Inside Texas State Hospital
"The judge or jury decides whether you're competent," ABC13 legal analyst Joel Androphy said at the time. "They're not the final say so. A jury or a court is the final say so, all they do is provide input," Androphy added about testimony of Miles' doctors.