Seminole, Oklahoma - State investigators are searching for a killer after two people were found shot to death behind a store in Seminole last week.

A report from the Medical Examiner's office Wednesday states that the two victims, 26-year-old Joseph Bounds and 30-year-old Summer Gokey, were both shot in the head and left for dead.

It's not yet clear exactly when the homicides occurred, but officials with the Oklahoma State Bureau of Investigation say it was 7:30 a.m. on Friday, March 20 when someone noticed an SUV in a ditch along a dirt road that runs behind the Seminole Wal-Mart.

“That person called the local police,” said Jessica Brown, OSBI spokesperson. “An officer went to the scene, peered inside the vehicle and he saw what appeared to be two victims, possibly, of a homicide.”

The OSBI was called in and agents arrived on the scene shortly thereafter.

“We sent investigative agents, as well as, crime scene agents to that area to begin investigating,” said Brown.

The only evidence of the murders still remaining at the scene five days later is a roadside memorial dedicated to Bounds and Gokey. OSBI has not identified a clear motive for the killing and have yet to name any suspects.

“We have been investigating,” said Brown. “We know it's a homicide and we have been running leads all across that area.”

Bounds and Gokey's loved ones also want answers -- many have taken to Facebook to express their condolences, and to ask that anyone with information please come forward.

“If anyone saw something that happened there or knows what happened there or knows anything about this homicide, they should call OSBI,” Brown stated.

Family and friends of Summer Gokey gathered in Stroud today for her memorial service. A funeral service for Bounds is set for Friday in Konawa.