Wednesday's mass shooting at a Parkland, Florida high school left 17 innocent people dead and more than a dozen others injured. Nikolas Cruz, a 19-year old student who had been expelled, was charged with 17 counts of premeditated murder this morning.

New details continue to emerge about the horror inside Marjory Stoneman Douglas High School, including how two brave coaches died while protecting students from the shooter.

According to reports, assistant football coach Aaron Feis, cross country coach Scott Beigel and athletic director Chris Hixon were among those killed during the shooting.

Feis, who also served as a security monitor at the school, reportedly pushed a student out of the line of fire while jumping between her and the shooter, according to the Sun-Sentinel. Another student detailed how Beigel opened his classroom up to students in the hallway to keep them safe from the shooter but was shot and killed as he tried to relock the door, according to ESPN.

"He was my hero, and he will forever be my hero," student Kelsey Friend told CNN. "I'll never forget the actions he took for me and for fellow students in the classroom. He was an amazing person and I am alive today because of him."