LOS ANGELES -- A young boy from Southern California is being called a hero after he donated stem cells to save his father's life.

Dr. Nick Mondek was at death's door until his son, Stephen, stepped in.

"This past April of this year I relapsed with leukemia," said Mondek, an anesthesiologist who works in the Los Angeles area.

Mondek had a stem cell transplant before. Now he desperately needed another one - yet he could not find a match.

"It came back very aggressive," Mondek said. "I was immediately hospitalized."

Mondek was running out of time.

"I'm thinking about my family, and I'm thinking about how I'm not ready to go yet," he told ABC Los Angeles affiliate KABC.

In his darkest hour, sitting in his doctor's office, Mondek had a thought.

"As soon as my doctor came in the room I

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