He was born September 9, 1936, in Grinnell, Kansas, the son of Joseph and Ann Zimmerman Manhart. Cletus graduated from Hoxie High School and Pittsburg State University in 1960.
He lived in Beloit from 1960 until 1966 he later moved to Silver Lake where he has lived for many years. Cletus was a teacher at Beloit for five years and then at Rossville for two years. He was a computer programmer working for the State of Kansas and later BC/BS in Topeka. Cletus was a member of St. Stanislaus Catholic Church in Rossville and the Knights of Columbus.
Cletus was preceded in death by his parents; brothers, Ray, Robert (Doris), and Joseph Manhart; sisters, Marcella (Floyd) Edgington, and Mildred Manhart.
On June 8, 1963, he was united in marriage to Louise Reiter at Beloit. She survives of the home.
Other survivors include his five children, Steve Manhart, Birmingham, AL, Jerry (Karen) Manhart, Shawnee, Karen (Dave) Palmer, Auburn, Joanna (Brian) Fair, Andale, and Jason (Jamie) Manhart, Silver Lake; his sister Loretta (Ed) Schwerdt, Topeka; nine grandchildren, Abbie and Chad Manhart, Brandon, Easton, Trent, and Carson Fair, and Jersey, Journey, and Jax Manhart.