He was a paranoid schizophrenic, officials said.
The Harris County Sheriff's Office investigation is ongoing and the district attorney's office is also investigating the circumstances surrounding Hicks' death.
An HCSO spokesperson Saturday explained that Hicks' death may not be a murder just because it was ruled a homicide.
A ruling of homicide means the death was not a result of natural causes, an accident or suicide.
HCSO officials said they will present their findings when their investigation is complete.