An Oklahoma man is accused of fatally shooting his twin sister and her young daughter in a chilling incident that unfolded in just minutes. Grant Wilson, 31, is facing two charges of first-degree murder for the deaths of his sister, Gabrielle Wilson, and her 17-month-old daughter in Poteau, a town located in eastern Oklahoma, according to the Oklahoma Bureau of Investigation.

The alleged crime was reported around 4 p.m. on a Saturday, when deputies from the LeFlore County Sheriff’s Office were dispatched to a residence on Old Darby Road following a report of a cardiac arrest. However, upon their arrival, paramedics informed them that the situation involved a shooting.

Inside the home, authorities discovered Gabrielle Wilson lying on her back, suffering from a fatal gunshot wound to the chin. She was pronounced dead at the scene. Investigators noted the presence of several silver-colored shell casings near her body, indicating multiple shots may have been fired.

The officers then proceeded to a bedroom where they found the 17-month-old toddler, who has not been named publicly. The child had sustained a gunshot wound to the head, and investigators found a bullet slug in her hair, as detailed in the probable cause affidavit obtained by Law & Crime.

“There was visible blood spatter on the floor and high on the wall behind her,” cops wrote.

Deputies went into a bedroom, where they found the toddler girl, who has not been publicly identified. She suffered a gunshot wound to the head and had a slug in her hair, the affidavit stated.

The twins’ father arrived on the scene and told cops his son had a “history of violent arguments and physical altercations” with Gabrielle Wilson, police said. He also said Grant Wilson allegedly owned the same caliber weapon used in the slayings.

Cops reviewed security footage from a neighbor that allegedly showed Grant Wilson pull up to his twin’s house in his gray Honda Accord at 9 a.m. Saturday. He left in his car at 9:04 a.m., cops said.

Investigators put out an alert for the suspect vehicle. Traffic cameras picked up his license plate around 11:30 a.m. Sunday just south of Atlanta’s airport, which is some 700 miles away from the crime scene. Cops tried to pull the suspect over but he allegedly led them on a brief pursuit. Officers stopped the vehicle and took him into custody.

Inside the car were two .40 caliber Glock handguns, which were consistent with the casings at the murder scene, cops said.

Grant Wilson is in jail in Georgia awaiting extradition back to Oklahoma.

“This was a senseless crime,” Hunter McKee, public information manager for the Oklahoma State Bureau of Investigation, told local ABC affiliate KHBS. “It’s been a heartbreaking story so far.”