A St. George man arrested in a weekend homicide was seen by witnesses standing over the man after he had been shot, according to the Dorchester County Sheriff’s Office.

Brian Richburg of 1352 Mulberry Road in St. George is being held at the county jail on charges of murder and possession of a weapon during a violent crime.

Deputies were called to 429 Reeves Farm Road on Saturday evening in reference to a shooting. Two men there told deputies that Richburg had taken the victim, Terrill Alexander Riley, 25, of Riley Circle in St. George, to Colleton Regional Medical Center for treatment of gunshot wounds, according to an incident report.

The men said they were inside the home when they heard four gunshots. They stepped outside and saw Riley drop to his knees, saying, “I can’t believe that you shot me,” the report stated. Richburg was standing beside Riley, according to an arrest affidavit.

The witnesses told deputies they saw Richburg place Riley in a black Honda and drive off, saying he was headed to the Colleton County hospital. While deputies were talking to the men, Richburg called one of the witnesses and informed him that “Riley did not make it,” according to an incident report.

Deputies and St. George police took Richburg into custody at a local Kentucky Fried Chicken where he works, authorities said.

Authorities found Richburg’s black Honda near Exit 62 off Interstate 95 early Sunday. A piece of the car’s bumper was found near an open gate on Risher Mountain Road, and Riley’s body was found nearby, partially submerged in a water-filled ditch off the road, according to an incident report.

Richburg later provided a statement to detectives implicating himself in the killing, stating that he shot Riley with a .40-caliber Ruger pistol, an arrest affidavit stated.

An autopsy determined Riley had been shot multiple times, Dorchester County Coroner Chris Nisbet said.

The shooting reportedly stemmed from an argument, but investigators are still trying to determine what sparked the conflict, Sheriff’s Lt. Tony Phinney said.

Richburg and Riley apparently attended Woodland High School together and they were among several people who had visited the Reeves Farm Road home Saturday to hang out and make music, Phinney said.

Richburg has a previous conviction for simple assault, and he was arrested last year for failure to pay child support, though no disposition is listed in his files, according to State Law Enforcement Division records.