X’Zavier Sharif Davis, 26 (picured), of South Carolina, who has been accused of shooting his live-in girlfriend and her son has now been charged with murder after Iven James Caldwell, age seven, died

A South Carolina man who has been accused of shooting his live-in girlfriend and her son has now been charged with murder after the seven-year-old boy died from his injuries.

X’Zavier Sharif Davis, 26, is accused of shooting at a vehicle containing his girlfriend, their two children and her son from a previous relationship following an alleged domestic dispute at their home early on Saturday morning, the Newberry County Sheriff's Office said in a Facebook post.

Both the mother and Iven James Caldwell were shot, and Caldwell succumbed to his injuries on Monday.

'He was a child that could touch anybody’s heart,' Caldwell's grandmother Dinnie Hutner told ABC News. 'To know Iven is to love Iven, and he had a great big smile. He’ll truly be missed in our family.'

Davis was originally charged with four counts of assault and battery with intent to kill. The count related to the shooting of the child has now been upgraded to murder.

Authorities said Davis came home at around 3.15am on Saturday to find the house locked, and when he eventually got in he began verbally abusing the woman, their two children, and Caldwell (pictured), who is the woman's son with a different person

Caldwell, who was a student at Gallman Elementary School at the time of his death, was a 'well-liked young man who had a bright future', his relative and Pastor James Boulware said.

Gallman Principal Nikki Hunter said of her student: 'Iven Caldwell was funny, loving, had many friends, charismatic, a true people person, and had the most beautiful, infectious smile. He worked hard and never gave up even if the work was difficult. We were blessed to have him be a part of our Gator Family.'

Authorities said Davis and Caldwell's mother got into an argument at around 3.15am on Saturday when Davis returned home to their house on Cherry Lane and the doors were locked.

Davis was shouting that he needed to be let in to the home but everyone had already gone to bed, and once he was able to gain entry he began verbally assaulting his partner and the children.

The women then gathered the children, exited through the backdoor of the home and got into a car in an attempt to flee. Davis then allegedly fired shots from a handgun at the vehicle.

Principal Hunter, who lives in the same neighborhood, said she heard the weapon being discharged.

'I just heard some gun shots, like pop pop pop pop pop pop, and I shook my husband and I asked him to get up, I suppose something had happened, somebody’s shooting,' Hunter said. 'It was so close, I thought it was outside my bedroom window.'

The woman gathered the children to flee in a car, which Davis allegedly began shooting at, hitting the woman and Caldwell (pictured). The woman drove them to Newberry County Memorial Hospital, but Caldwell had to be transferred to a hospital in Columbia due to the severity of his injuries, where he died at around 2pm on Monday

As the mother was driving to Newberry County Memorial Hospital she noticed Caldwell had been shot in the head.

Due to the severity of his injuries he had to be transferred to another hospital in Columbia, where he died at around 2pm on Monday.

'As a parent, my heart just aches for the mother and children who had to watch this child be shot and eventually die from this senseless act of violence,' Sheriff Lee Foster said.

'It is simply abhorrent to me that this child’s life was taken because of the willful, senseless, and reckless actions of this suspect.'

The family has said it will hold a memorial service for Caldwell on Saturday.

Davis is currently in custody at the Newberry County Detention Center, where he is being held without bail.