CLINTON — Michael T. Mannix, 78, of Clinton, passed away at 12:33 a.m. on December 27, 2021, at OSF St. Joseph Medical Center, Bloomington.

Mass of Christian Burial will be conducted at 10 a.m. on Friday, December 31, 2021, at St. John’s Catholic Church, Clinton, with the Rev. Fr. James Owusu-Yeboah celebrant. Burial will follow at Illini Cemetery, Warrensburg. Visitation will be held from 5–7 p.m. on  Thursday, December 30, 2021, at Calvert Funeral Home, Clinton, with Rosary Service at 4:30 p.m.

Memorials may be directed to Clinton Area Crime Stoppers or St. John’s Catholic Church.

Michael was born on September 4, 1943, in Seneca Falls, N.Y. the son of Robert E. and Dorothy (McArdle) Mannix, and he grew up in Ovid, N.Y. He married Janet Disbrow on June 8, 1968, in Clinton.

Survivors include his wife, Janet Mannix, Clinton; children, Joseph (Tina) Mannix, Warrensburg, and Jeffrey (Stacey) Mannix, Davis Junction, Ill.; grandchildren,  Kiersten, Meghan, and Tyson; step-grandchildren,  Clayton, Demi, and Logan; and step-great-grandson, Karter; brothers, Patrick (Sara) Mannix, Gainesville, Fla. and Kevin (Peggy) Mannix, Ft. Myers, Fla.; nephews, Tom Mannix, California and Travis Mannix, Florida; and nieces, Jennifer (Susan Bluer) Mannix, California and Michele (Adam) Polo, New York.

Michael was preceded in death by his parents, Robert E. and Dorothy Mannix; brothers, John Mannix and Robert Burns Mannix; father-in-law, William Disbrow; and mother-in-law, Jewell Disbrow.

Michael attended South Seneca High School, in Ovid, N.Y., and went on to study at Eastern Illinois University, where he played football for four years.  He then graduated from Southern Illinois University, Edwardsville.   His first job after college was teaching grade school PE and coaching high school football. 

In July 1970, he joined the Illinois Bureau of Investigation; a newly founded law enforcement agency.  In 1975, Michael transitioned from the bureau and established the security system at the Clinton Nuclear Power Plant.  He rejoined the Illinois State Police Investigations Unit in 1978 and retired from there in 2001.

Michael was a member of St. John’s Catholic Church, the Knights of Columbus, the Eagles, and the Elks.  He coached his sons in Khoury League, JFL football, and served on the board of the Friendship Center, Clinton Area Crime Stoppers, the police and fire commissioners and zoning board, in Clinton.  Michael was an avid Cubs fan and enjoyed golfing.

Due to his outgoing personality, he never met a stranger.  Michael will be dearly missed by his family and friends.

Online condolences may be made at www.calvertmemorial.com