Sole appearance of Gailard Sartain as C.D. Parker. The character was later portrayed by Noble Willingham.
In addition to driving a GMC truck and a Dodge Ram Walker also drove a Ford Bronco.
Near the start Walker walked into a Mex bar to apprehend some criminals. One of the crims said, "You got no right!" So Walker punched him with his right fist. Learn terminology, criminals.
According to Gailard Sartain, he wanted to continue portraying CD Parker for the remainder of the series but the producers thought he was too young for the part especially considering he is actually younger than Chuck Norris. Gailard even asked if he could be put in an aging spa but the producers declined and Noble Willingham was ultimately cast.
Mobley was the very first Ranger on the show to be killed in the line of duty. In real life, the last Texas Ranger to die happened on January 22, 1987 when Stanley Guffey was shot and killed while attempting to rescue a kidnapped child from a criminal.