Steven L. Mastroianni, age 81, of St. Charles, MO, formerly of Florissant, MO, passed away peacefully on Saturday, April 11, 2026, at Anderson Hospital in Maryville, IL.

He was born on September 4, 1944, in Santa Ana, CA, to the late Louis and Esther (née Laman) Mastroianni.

Steven married Darlene Statler and together they raised their three children in Florissant, MO. He dedicated much of his life to education, earning his Bachelor of Arts degree from Southeast Missouri State University. He went on to serve as a teacher at McCluer High School in Ferguson, MO, where he made a lasting impact on his students both in and out of the classroom. In addition to teaching, he was deeply involved in athletics, coaching football, wrestling, and track, sharing his passion and mentorship with countless young people.

An avid outdoorsman, Steven found great joy in fishing trips to Canada and hunting. He also enjoyed spending his time golfing and playing pickleball. Known for his active lifestyle and adventurous spirit, he embraced every opportunity to be outdoors and stay engaged.

Steven married Dixie Heiskell in 2012 and they made a life together in St. Charles, MO.

In addition to his parents, he was preceded in death by a son, Jeffrey Mastroianni.

He is survived by his loving wife, Dixie Mastroianni of St. Charles, MO; two daughters: Michelle Vaccaro and Sasha (Jason) Cummings; three step-children: Aimee (Mark) Edwards, Matthew (Candice) Schreiner, and Elizabeth (Jeremy) Newell; five grandchildren: Alex, Ian, Izzy, Dora and April; five step-grandchildren: Elizabeth, Isaac, Sam, Loren and Easton; and a brother, Gregg Mastroianni.

In keeping with his generous spirit, Steven chose to donate his body to Saint Louis University for the advancement of medical education and research. His legacy lives on in the many lives he touched.