A Georgia man facing murder charges for gunning down his estranged wife and her 7-year-old niece at an apartment they shared with family allegedly vowed to “pop every kid” and “kill everyone” at the home in threats made before the shooting, his wife’s mom alleges.

“They were actually in the midst of serving him papers but couldn’t find his whereabouts,” Nakita Bruce, mother of victim Tomekia Pullins, told local ABC affiliate WSB this week.

Suspect William Almond, 43, is accused of killing Pullins, 29, and her nephew, Dior Scott, at her family apartment on Friday. Almond and Pullins allegedly had marital issues and often fought over their kids, per Bruce.

The defendant had “told us plenty of times” that if the child didn’t come back, “he would pop every kid in here,” the grieving mom told WSB. “He will kill everyone in this house.”

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According to Bruce, Almond allegedly tried to “get in through the door, but he couldn’t.” She said security footage shows him moments later allegedly shooting through a window and striking Pullins with gunfire.

“When he was not allowed in, [witnesses] say he broke a window and fired multiple shots inside, hitting both victims,” DeKalb County police officials report in a press release. Almond ran from the scene but was later apprehended without incident, the release says.

“I want to thank the DeKalb County Police Department for its swift and diligent work in apprehending the suspect in this heartbreaking case,” said DeKalb County CEO Lorraine Cochran-Johnson. “Their thorough investigation was instrumental in identifying these familial relationships and ensuring that the suspect was brought into custody.”