A Warren County man has been charged with homicide. TBI agents joined investigators from the sheriff’s office in looking into the murder of Stephen Pohl, who died this past Tuesday from an apparent gunshot wound at his home on Lewis Road. During the course of the investigation, authorities developed information leading to Pohl’s roommate, 61-year-old Gregory Koller of McMinnville as the individual responsible. Last night, agents arrested Koller and charged him with criminal homicide and tampering with evidence. He was taken to the Warren County jail and placed under a million dollar bond.