The Grimes County District Attorney's Office said Monday the victim in Sunday's shooing in Bedias had a history of metal illness.
Family and friends of Christopher Miller told investigators they were trying to get the College Station man help.
Grimes County District Attorney Tuck McLain said Monday his office is unaware if Miller had received treatment in the past. As for his criminal history, Miller was charged with aggravated assault in 2002.
The Texas Rangers are investigating the shooting that happened at 1:24 a.m. on FM 2620 in Bedias. Sheriff's officials say Christopher Miller of College Station was allegedly walking down the road unclothed.
Officials say Deputy Jason Smith responded to the scene and told Miller, 26, to lie on the ground.
Miller allegedly complied, but later, officials say he jumped up and ran toward the deputy. Smith opened fire, killing Miller.
Miller was pronounced dead at the scene. His body has been taken to the Dallas Medical Examiner's Office for an autopsy. As of Monday evening, preliminary autopsy results had not been released.
The case has been handed over to the Grimes County District Attorney's Office. The case could go before a grand jury within the month.