TV taught him CPR: Heroic 9-year-old boy saves baby sister’s life

This past Sunday, 9-year-old Tristin Saghin saved his 2-year-old sister's life.

The Las Vegas children were visiting their grandmother's in Mesa, Arizona, when Tristin's sister, Brooke, wandered into the backyard alone and fell into the pool. Their horrified mother found the toddler lying face down in the water and pulled her out.

The little girl was unconscious and not breathing.

Tristin heard his panicked mother and grandmother outside and ran to his sister's side. He performed CPR and told his grandmother to call 911.

The sole source of his first-aid training? Television.

Tristian told abc15, "I just went running outside and I did CPR on her. I knew what I was doing."

A few minutes later, his little sister started to breathe again.

Paramedics arrived shortly after and took her to the hospital. Thanks to her big brother, Brooke is expected to recover fully.

"She's really beautiful and I love her very much," Tristin said.