A Burleson County man is facing aggravated assault charges after allegedly shooting his stepbrother in the head Monday night.

More serious charges could be on the way for the incident that happened off Highway 21.

Investigators say Rod Sterling Clanton confessed to shooting his stepbrother, Steven Craig Bishop, after Clanton loaned a nephew $2,500 several months ago.

"He called yesterday to have him pay the money, and when they said they couldn't, there was some threats made. It was really a bad situation for the family. The nephew talked to his brother and his brother decided to come here to try to resolve the issue," said Sheriff Chris Kirk of Brazos County.

Kirk says both men had guns in their pickups during the dispute.

"Bishops' semi-automatic pistol we found laying in his lap. Of course we found a revolver in Clanton's truck laying on the seat," Kirk said.

Preliminary autopsy results indicate Bishop died of a gunshot wound to the head. The sheriff tells us both men met at OSR and Highway 21 because they were familiar with that location.

"Once we have the final autopsy report, and the rest of the evidence on the cause and manor of death, there will probably be an upgrade in the charges," said Kirk.

Bishop was from Bogata in Northeast Texas, but Sheriff Kirk says he had been living in the area.

"Had some work out in the oil field that kept him here in this area, so that's why he was in College Station. Clanton actually called 911 and we have that recording in which he's extremely emotional, but he admits that his brother had a gun and he shot him," said Kirk.

Clanton remains in the Brazos County Jail on $75,000 bond.

The Sheriff's Office says Clanton told them he doesn't remember firing the gun.

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UPDATE: The Brazos County Sheriff's Office is charging Rod Sterling Clanton, 50, with Aggravated Assault with a Deadly Weapon/Family Violence. He's accused of shooting his stepbrother Steven Craig Bishop in the head off Highway 21 near OSR Monday night.

Investigators say that Clanton loaned money to a nephew several months ago and called Monday to demand his money back, threatening the nephew. Bishop heard about the demand and threat and called Clanton to confront him. According to the press release, the two agreed to meet off Highway 21.

According to the sheriff's office, the two men sat in their trucks and argued. Investigators say that Bishop showed a handgun during the argument causing Clanton to pull his loaded handgun out and point it at his step-brother. Clanton told investigators that he didn't remember firing his gun and that he could have "blacked out."

A .357 Magnum revolver was found in Clanton's truck, with one bullet missing. A loaded semi-automatic pistol was found in Bishop's truck. Investigators don't believe it was fired.

Clanton stated that he called 9-1-1. The sheriff's office says that Clanton was extremely emotional and said "my brother had a gun and I shot him."

Clanton is in the Brazos County jail under $75,000 bond.

ORIGINAL STORY: Brazos County deputies say a 54-year-old man was shot in the head Monday evening along OSR near Highway 21. One person is in custody at this time.

Deputies were called to the area in west Brazos County just before 6:30 p.m. Monday.

Upon arrival, a sheriff's deputy found two pick-up trucks parked next to each other in a driveway.

Inside one of the trucks was Stephen Craig Bishop of Bogota, Texas, who had a gunshot wound to the head. Investigators found handungs in each of the truck. The person who called 9-1-1 was inside the other truck.

Bishop was pronounced dead at the scene. Deputies and investigators closed Highway 21 West and a portion of OSR to investigate the crime scene. Highway 21 reopened at 8 p.m., while investigators left the OSR scene at 12:45 a.m.

According to the press release, its believed the subjects knew each other and had talked earlier in the day on the phone, arguing about a matter and agreed to meet at the location in Brazos County.

The release says the other person is being detained as a person of interest and is cooperating with authorities.

Sheriff Chris Kirk says the investigation will continue and there is no threat to the general public.