He lost his daughter to a fatal police shooting almost a month ago. Now, he’s gone, too.

The father of Atatiana Jefferson , the black 28-year-old woman who was shot and killed by a white Fort Worth police officer responding to an open door call, died on Saturday, a family spokesman said.

Ms. Jefferson’s father, Marquis Jefferson , died around 6 p.m. at the Methodist Charlton Medical Center in Dallas , where he had been since Friday night after having heart complications and cardiac arrest, the spokesman , Bruce Carter , said on Sunday.

Mr. Jefferson, 58, had been struggling with the death of his only child, Mr. Carter said.

“I can only sum it up as a broken heart,” he said. “He had to go through so much just to get through the services as a father, and continually doing good to make sure that who he was in their relationship was something he could honor.”

Mr. Jefferson’s death, so soon after his daughter’s, underscores the trauma and stressors faced by families who are touched by police violence.