Feis is one of the first victims named in the shooting that killed 17 people.
According to the Miami Heraldand CBS Miami, citing those at the scene, Feis, 37, shielded students from bullets by pushing them inside a classroom to protect them, laying down his own life for others.
The assistant coach and security guard suffered a gunshot wound and later died after he was rushed into surgery, according to the school's football program and its spokeswoman, Denise Lehtio. He reportedly died as a result of wounds from using his body as a shield for students during the attack.
The attacker was arrested by police and taken into custody.
Feis graduated from the school in 1999 and worked mainly with the junior varsity, the team website said.
We hope people who love Aaron will find comfort in visiting his profile to remember and celebrate his life.More news: Suspected Parkland Florida High School Shooter Tied To White Supremacist Group
It is with Great sadness that our Football Family has learned about the death of Aaron Feis. "As I was being escorted out of the building, I had to step over him".
"This is a kid who went from middle of the pack previous year to being just lights out", his coach, Andre Bailey, of TS Aquatics in Broward County, Fla., said.
In recent months, Cruz had been living with the family of a friend from his old high school, after his adoptive mother Lynda passed away in November.
Feis, a former graduate of Douglas, played centre for the school's Eagles from 1995 until 1998. We should celebrate the teacher who ran over and opened her door to give those students a place to hide. You may want to learn more about what drove him to do such a horrific thing as murder 17 people.
Bryan coached at Douglas alongside Feis from 2006 to 2008.
Last year, Hixon was named Broward County Athletic Association's Athletic Director of the year, the newspaper reports.
Connell said his brother leaves a wife, Melissa Ann Feis, and their preteen daughter.