LEXINGTON, Oklahoma - Agents with the Oklahoma State Bureau of Investigation have made one arrest Monday in the shooting death of a Lexington man.

Richard Dean Landsdale, 37, was arrested for the death of 55-year-old Gary Norton Sr. Landsdale was booked into the Cleveland County Jail on a complaint of first-degree murder.

According to the OSBI, Norton was shot while he slept in his home early Easter morning. The Medical Examiner's office determined Norton died of a gunshot wound to the head.

Agents say they expect to make another arrest in the case.