He started his pro career in 1963, playing Class-D ball for the Reds organization in Tampa, Florida and later that year made the jump to the then-Triple-A San Diego Padres.

[3] The first batter he faced was Jesús Alou (who singled) as McCool pitched two innings in relief of Al Worthington in a 15-5 Reds loss to the San Francisco Giants at Cincinnati's Crosley Field.

[3] After retiring from baseball in 1970 McCool moved to Centerville, Ohio where he raised his family.

[1] In 2013, he was inducted into the Indiana Baseball Hall of Fame as a 1962 graduate of Lawrenceburg High School.

He died in his Summerfield, Florida home as the result of the heart condition on June 8, 2014.