LUFKIN, TX (KTRE) - After nine months of investigation, the August 2010 deaths of Brianna Shaw and Artha Griffin have been ruled a murder-suicide.
Robin Griffin cried Tuesday morning as she stood on the porch where her father died last August on Davis Street.
"There's not a doubt in my mind that somebody killed him," said Robin Griffin. "I know he wouldn't kill himself."
Police closed her father's case -- ruling 64-year-old Artha Griffin shot and killed Brianna Shaw, 23, before turning the gun on himself.
"From the beginning, the crime scene appeared to investigators to be consistent with a murder-suicide, but standard protocol for dealing with the scene that may be a suicide of any type is to treat it as a murder investigation," said Lufkin Police Department Det. J. B. Smith.
DNA evidence placed only Griffin and Shaw at the crime scene.
Police said gunshot residue revealed Griffin fired a gun, not Shaw.
Investigators never found the gun Griffin supposedly used.
Police said they believe they know who took the gun from the crime scene, but they don't have enough probable cause at this time to charge that person with a crime.
Shaw's mother has no doubt drugs played a role in her daughter's death.
"She was a totally different person after the drugs than she was before," said Peggy Scurlock.
Both families refuse to believe the deaths are a result of a murder-suicide.
"The police have never contacted us or anything and let us know anything about it, there's no way my dad killed himself at all," said Robin Griffin. "They can't make me believe that."
"I do respect their hard work," said Scurlock. "But I just can't believe that's what happened."
"I can't say what happened in this situation, but it becomes very difficult for some families and the friends that are left behind to understand this," said Smith.
"Really God knows or whoever was there knows, you know, but I know my daddy didn't kill himself," said Robin Griffin.
Detectives may never know Griffin's motive, nor why anyone would take the murder weapon.
There are so many questions that may never get answers because the key witnesses are dead.
Although the case is considered closed, the Lufkin Police Department never fully closes a case.
It could be re-opened if any other tips come in.
According to police spokesman J.B. Smith, detectives made the conclusion based on the following evidence:
* Laboratory testing of evidence collected from the scene found DNA of only Griffin and Shaw.
* Gunshot residue indicated Griffin fired a gun.
* Gunshot wounds indicate Shaw was murdered and Griffin committed suicide.
* Blood spatter experts from an independent forensic consulting firm evaluated the scene and corroborated the Detectives' finding of murder/suicide.
Smith said detectives believe they have identified the person responsible for removing the gun from the scene following the deaths but have not developed enough probable cause to charge that person with a crime. Police will not release the name of this person because a criminal charge is not pending.
Police say the dead bodies were found the morning of Aug. 29, on the 300 block of Davis Street.