Morrow was selected by the Los Angeles Rams in the 28th round (336th overall pick) of the 1956 NFL draft. He played three seasons and appeared in 35 games for the Rams, principally as a center, during the 1956, 1958, and 1959 NFL seasons.[1] Morrow next played seven seasons with the Cleveland Browns from 1960 to 1966.[1] He was selected to play in the Pro Bowl in 1961 and 1963 and was the starting center on the 1964 Cleveland Browns team that won the 1964 NFL Championship Game.[1]