A 13-year-old boy in a vegetative state showed signs of life after his parents signed paperwork to donate his organs.

Trenton McKinley was injured while riding in a trailer being pulled by a dune buggy two months ago, according to WALA. He was rushed to the hospital with seven fractures to his skull.

"All I saw was a stretcher with his feet hanging out. He was dead a total of 15 minutes," his mother, Jennifer Reindl, recently told WALA. "When he came back, they said he would never be normal again. They told me the oxidation problems would be so bad to his brain, that he would be a vegetable if he even made it."

Trenton was brain dead and barely breathing for several days, as his parents wrestled with the decision to donate his organs in March. They signed the papers. A day before doctors were going to pull the plug, Trenton showed signs of life.

"There's no other explanation but God,” Trenton said. “There's no other way. Even doctors said it."

Trenton continues to recover at UAB Hospital. He has undergone three brain surgeries, and continues to suffer nerve pain and seizures, according to WALA.

"From no brain waves to now walking and talking and reading, doing math. A miracle," Reindl told CBS News.

crowd source funding account was created to help pay for medical costs.