Ken "Pick" Pickerill passed away at the age of 91 on Thursday night.
According to a letter from Oswego High School Principal Mike Wayne, Pickerill was an integral part of the high school for nearly 60 years.
Pickerill was the athletic director and head football coach for 15 years, earning five football championships.
He also served as head wrestling coach for 11 years, with eight all-state wrestlers and three state championships; he was the school's baseball coach for nine years, with one regional and one district championship in that time.
Pickerill was inducted into the Illinois High School wrestling, baseball and football coaches hall of fame.
In 1998, Pickerill was recognized by the Illinois State Board of Education as an Illinois Merit Winner.
A private funeral and burial service will be held.