First responder, Angel Garza rushed to Robb Elementary School on Tuesday, May 24.
He was there to help the students and teachers injured in a Texas primary school mass shooting.
The medical aide arrived just as kids were being escorted from classrooms. He was drawn to one young girl who was covered in blood, from head to toe.
As he tended to her, he asked where she was injured.
"She said she was okay," Garza told CNN.
"She was hysterical, saying that they shot her best friend — that they killed her best friend, she was not breathing."
And then the young girl told him: Her best friend's name was Amerie.
Amerie Jo Garza. His daughter.
The young girl Garza was assisting was covered in his daughter's blood.
Amerie was just one of 21 devastating fatalities that occurred that day.
The Garza's story is particularly heartbreaking.
Watch Angel Garza speak to CNN about his late daughter, Amerie. Post continues below.