Oklahoma City Police have identified a human skull as the remains of 16-year-old Anne Josette Hill of Piedmont, said Oklahoma City Police Sgt. Jennifer Wardlow.

A seismograph crew reported finding the remains Thursday afternoon in a rural area of McClain County, just south of Goldsby, near State Highway 74 and West Ladd Road, according to police.

“Shortly before 9 p.m. last night, it was confirmed that the human remains located were those of Anne Hill,” Wardlow said.

Oklahoma City Police are currently working with the Oklahoma State Bureau of Investigation, McClain County Sheriff’s Office and the State Medical Examiner’s Office. A grid search began Friday morning.

Hill was listed by Oklahoma City Police as a missing person in April of 2014 after her mother had called to report Hill as a runaway, saying she had not seen her for two days.

“Approximately a week later, Hill’s car turned up at an Edmond park. She was nowhere to be found,” Wardlow said. “The case was transferred to our Homicide Unit, who made two arrests in October of 2014.”

On April 11, 2014, the Oklahoma County District Attorney’s Office filed a first-degree murder charge against Chadd Phillip Raymond, 17, of Deer Creek, and Chloe Thomas, 17, of Oklahoma City, according to Oklahoma County District Court records.

Wardlow said investigators have worked diligently on this case, following up on any potential leads as to where Hill’s body might be.