His son, John Donmoyer Jr., said he died at St. Luke's Hospital-Allentown after a brief illness.
The 1957 Allentown High graduate had an extensive football background and played in both high school and at Muhlenberg College, but carved his niche as one of the most successful coaches in local basketball history.
His career record, according to Morning Call records, was 624-423 over 40 seasons, including 12-11 in the 2013-14 campaign. His 1,047 varsity games coached was also a local record.
Donmoyer, for whom the court at Allen High School's Sewards Gym was named last December, first served as the JV coach for the legendary J. Milo Sewards.
He succeeded Sewards as Allen's coach in 1974 and guided the Canaries for 23 seasons, posting a remarkable 423-226 record that included five East Penn Conference championships and six District 11 titles. One of those district crowns came in his first season.
He was a three-time East Penn Conference coach of the year and the 1983-84 Morning Call coach of the year in the first year the newspaper honored a coach.
The highlights of his career, however, were back-to-back PIAA Class 3A Eastern championships in 1979 and '80.
Donmoyer, a member of the Lehigh Valley Basketball Hall of Fame, retired as a teacher and coach at Allen in 1997 but still wanted to be involved in basketball.
He was hired at Moravian Academy and almost instantly brought the program at the Class A school to a respectable level.
In his 17 seasons as coach, Donmoyer's Lions qualified for the District 11 tournament with a .500 or better record 14 times. Before his arrival, Moravian Academy only qualified for districts four times in its entire history. He coached six 1,000-point scorers at Moravian Academy and three at Allen.
Donmoyer, of Allentown, had planned to come back and coach in the 2014-15 season as Moravian Academy opened a new athletic facility and began play as a full-time Colonial League member.
Besides the unprecedented number of victories, Donmoyer was considered one of the classiest, nicest people in local sports. He was well-respected by his players, fellow coaches, administrators, officials, media and everyone who knew him on the local sports scene.