Police have arrested a third suspect in connection with the fatal shooting of a 7-year-old foster girl who was struck in the head while sitting on the couch of her DeKalb County home.

Dwayne Eric Allen, the 27-year-old uncle of two siblings previously charged in the April 12 shooting, was arrested Friday at an Atlanta business, DeKalb sheriff’s office spokeswoman Cynthia Williams said.

According to warrants issued Thursday, Allen and his nephew, 21-year-old Antoine Allen, shot up an Ellenwood home on Satellite Boulevard with an AR-15 rifle.

RELATED: 7-year-old girl shot while sitting inside DeKalb home

At least three bullets hit the home’s front door, and another four went through two windows, AJC.com previously reported.

Mariaisa Thomas, the 7-year-old inside the house at the time, was hit in the head, police said. She died of her injuries 10 days later.

Mariasia Thomas, 7, died 10 days after being shot in the head at her home in DeKalb County. Three people have been charged with her murder. 

Credit: Channel 2 Action News

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Credit: Channel 2 Action News

MORE: 7-year-old girl dies after being shot in head in DeKalb

Dwayne Allen is charged with murder and aggravated assault. His nephew and niece, 23-year-old Keadesia Allen, were arrested May 13 for their alleged role in the child’s shooting death.

Keadesia Allen (left), Antoine Allen

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ALSO: Siblings arrested in death of 7-year-old girl shot in the head

“She was an innocent little girl just watching TV on the couch,” Thomas’ biological mother, Chanrica Boyd, previously told Channel 2 Action News. “It’s still unreal that this is my child that was shot up in this house due to something that wasn’t even involving her.”

Thomas was in the custody of the Division of Family and Children Services at the time of the shooting, authorities said. She had been in the foster home for only about two weeks.

Dwayne Allen, Antoine Allen and Keadesia Allen all remain held without bond at the DeKalb County Jail, records show.

Dozens of balloons decorated the night sky in memory of a 7-year-old who died after a stray bullet hit her inside her foster home.