The moments after Saturday's shooting at an outdoor mall near Dallas, Texas, will never leave Joshua W. Barnwell's memory.

Barnwell, who rushed in to help those who were wounded, said he had to cut away shopping bags and purses from the injured, "because all they were doing was shopping with their families," he told “Good Morning America” on Monday.

A women who was conscious asked Barnwell, who has prior military experience, to help her daughter.

“This woman had massive trauma, five to six gunshot wounds,” Barnwell said.

He went to the daughter to start chest compressions, he said.

“When I saw the massive amount of blood come out from her when I gave her Chest compressions to her back,” Barnwell said. “I knew she was gone.”

The moment will never leave his memory, he said. As he helped victims, he cut away shopping bags and purses, “had to cut shopping bags and purses off of them because all they were doing was shopping with their families.