Saiane Studie, the Tahlequah teenager who allegedly stabbed her stepfather to death on June 25, has been charged as an adult with first-degree murder.

On Tuesday, District Attorney Jack Thorp said his office will continue to investigate the case to determine the motive.

“This is just the formal beginning of the case. This person is presumed innocent, and that presumption remains until and if the state proves the case by proof beyond a reasonable doubt,” said Thorp.

Gary Maize was purportedly stabbed to death by his 15-year-old stepdaughter on June 25 in Briggs. Cherokee County Undersheriff Jason Chennault said Studie was the one who called 911 once she got to an apartment in Tahlequah. She told officials she “had to do it in self-defense.” However, evidence collected at the scene does not corroborate that claim, Chennault said.

The teen drove a truck belonging to Maize into Tahlequah from the scene and called 911 around 4 p.m. Once investigators arrived at the apartment, she refused to speak with anyone, asked for a lawyer, and was arrested.

The undersheriff confirmed Maize suffered from multiple stab wounds, and the murder weapon was found near the body in the yard.

The teen is still at Craig County Regional Juvenile Detention Center in Vinita. Court records doesn't yet list a defense attorney.