The teen then shielded a child hiding under a pew.
Warden, 56, was one of more than two dozen people killed in Sunday's shooting at the Sutherland Springs church.
Her grandson Zach Poston was one of about 20 other people injured and described what happened from the San Antonio hospital where he was still recovering yesterday, said Warden's brother Jimmy Stevens.
"Basically, Peggy stood up and just shielded over him while the shooter was shooting. And when she got hit in the back he said he turned, because he heard her, and when he turned to see if she was OK, she passed away immediately," Stevens said.
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"So he took what Peggy gave him and he passed it on to help someone else," Stevens told The Associated Press yesterday. He said it's his understanding that the child survived.
Stevens said one of the congregants was a nurse who was able to help bandage Poston, likely keeping the high school senior from bleeding to death.
The gunman shot and killed 25 people at the church.
Authorities have put the official toll at 26, because one of the victims was pregnant. The gunman died of what appeared to be a self-inflicted gunshot wound after being chased by bystanders and crashing his car.
Stevens said his sister taught Sunday school, but had only returned to being active in the church in recent months after spending more than a year caring for her husband, who had cancer and died in July.