Kacey McNulty began his wrestling career at Tigard High School, becoming the school's first freshman to qualify for the state tournament. After one year at Madras High School, he completed his final two high school seasons at Redmond High School, where he served as team captain as a senior.

A three-time OSAA state placer, Kacey continued his wrestling career at Southern Oregon University. He earned three NAIA All-American honors, including a national runner-up finish as a member of the Raiders' 1994 national championship team. He remained at Southern Oregon for one year as a graduate assistant coach before continuing his coaching career at Grants Pass and Glencoe High Schools.

In 2000, Kacey became head coach at North Medford High School, where he coached for four years before being selected as head coach at Eagle Point High School. He led the Eagle Point program for 21 years and was selected as conference Coach of the Year four times.

During his Eagle Point tenure, Kacey coached 250 state qualifiers, 97 state placers, 19 state finalists, and eight state champions. Three of his wrestlers went on to earn college All-American honors. He also served the Eagle Point youth wrestling program as president for 10 years and as a board member for 20 years.

Kacey concluded his high school coaching career in 2024 after more than two decades at Eagle Point and later served as an athletic director at Redmond High School.

Kacey and his wife, Jill, have four children.