After the campaign, he was Houston's fifth pick and the ninth overall selection in the 1961 Major League Baseball expansion draft. In the very first inning of the very first Colt .45 game, he stepped in a hole and broke his ankle.[3] Heidt would play just 23 games for the 1962 Colt .45s during their maiden season as Carl Warwick won the starting center field job. Heist then returned to Triple-A for three more seasons before becoming a coach on managerGrady Hatton's Houston Astros staff in 1966–67. He later served as a scout for the Astros, Cubs, San Diego Padres and San Francisco Giants, with one season back in uniform as a coach for Padre manager Jerry Coleman in 1980.
As a Major Leaguer, Heist registered 126 hits, including 20 doubles, six triples and eight home runs. He died in Tahlequah, Oklahoma, at the age of 78.[4]