"In my estimation, he is a hero. ... We do know he was trying to intervene," Reno Deputy Police Chief Tom Robinson said about the fallen staff member.
Landsberry was a military veteran who leaves behind a wife and two stepdaughters, said his sister-in-law Chanda Landsberry. She said she wasn't surprised he stepped in to stop the rampage.
The motive isn't yet known. Names of the suspect and victims haven't yet been released.
"As you can imagine, the best description is chaos," Robinson said. "It's too early to say whether he was targeting people or going on an indiscriminate shooting spree."
Students from the middle school and neighboring elementary school were evacuated to the nearby high school, and classes were canceled. The middle school will remain closed for the week.