Susy Solis, NBCDFW.com
The Justice Seekers of Texas is calling for a federal investigation into an officer-involved shooting that left a 25-year-old man dead and a 11-year-old injured.
The family of a man who was shot to death by a Dallas police officer is demanding that the department fire the officer and charge him with murder.
Mackey's family and Justice Seekers Texas, a civil rights and social justice organization, is calling for a federal investigation into the incident.
"It would seem to me that somebody that's unarmed should not be shot," the Rev. Peter Jackson said.
Tate said Mackey did not listen to his verbal commands to show his hands as he approached him in a breezeway.
Tate fired shots, killing Mackey and wounding 11-year-old Xavier Collins, who was shot in the forearm.
Police did not find a weapon on Mackey.
Mackey's father, Eric, said he saw the entire incident unfold.
"I said, 'That's my son coming right there,'" he said. "As soon as I said that, they shot him. I'm trying to keep composure about this, but it's hard to watch your son get murdered."
Justice Seekers Texas said it hopes for answers in what it calls an unjustified murder. The group is hoping to have a sit down meeting with Chief David Brown.
Tate is on on administrative leave while the Dallas Police Special Investigations Unit investigates the shooting.
Once the investigation is complete, police will turn over their findings, as well as the medical examiner's report, to the Dallas County District Attorney for review.
The Dallas County Medical Examiner has not yet released a cause of death.