He was born on May 31, 1934, in Springfield, IL, the son of Frank and Sue (Lascody) Brennan.
Mick was a 1952 graduate of Cathedral Boys High School in Springfield, Illinois. His faith was an important part of his life, and he was a devoted and faithful member of St. Katherine Drexel Parish in Springfield. Mick honorably served his country in the United States Air Force from 1955 to 1958, spending much of his service stationed in Germany.
A lifelong sports enthusiast, Mick enjoyed golfing and cheering on the St. Louis Cardinals and Green Bay Packers. He also had a deep appreciation for music, particularly the timeless sounds of Big Band and Jazz.
Mick worked as an independent contractor who was known for his expert craftmanship and a job well done for a fair price.
He was preceded by his parents, Frank and Sue; sisters, Sr. Marilyn Brennan, OP and Carol Slaughter; and long-time companion, Margaret Pickering.
Mick is survived by his brother, James (Kathy) Brennan of Springfield; sister, Eileen (Jerry) Harbauer of Oak Brook, IL; nephews, Craig Harbauer, Patrick Harbauer, Ken Harbauer, Christopher Slaughter, and Ryan Brennan; and nieces Susan Slaughter and Michelle Brennan.
A Mass of Christian Burial will take place at 11:00 a.m. on Saturday, December 12, 2026, at St. Patrick Catholic Church, 1720 S. Grand Ave. E., Springfield, IL 62703, with Rev. Jim Isaacson officiating.
Burial will take place at Calvary Cemetery at a later date.
Memorial Contributions may be made to: St. Martin De Porres Center, 1725 S. Grand Ave. E., Springfield IL 62703.
Please visit www.butlerspringfield.com to offer condolences.
