"KNOW that Frank Terry worked there, but I can't remember what his shift was, except that it MIGHT have been 9PM-midnight."
Where's Michael Hagerty when you need him?
In this case, at a barbecue at a friend's house on Camelback Mountain, but I'm back now.

Frank replaced Donn Tyler as the KHJ relief guy (a neat RKO position that paid a fulltime salary...union scale, most likely...and benefits. The one catch was that you were the guy...if the phone rang, you answered. Two months without a day off? Hey, it happens) only a couple of months after the May 1965 launch of Boss Radio.
By the end of the year, he'd replaced Roger Christian in 9AM-Noon, and stayed there until February of 1967, when he moved back to the utility/fill-in role, replacing Steve Clark.
The change was short-lived, as Bobby Tripp became ill and Frank ended up back in middays, plus a couple of weekend shifts
and filling in for the other guys whenever they were sick or on vacation. After Bobby died, they just made it official, and brought in Bill Wade as the new utility/fill-in guy. Frank stayed in middays until the fall of 1968, when he left for KFRC and was replaced by Scotty Brink.
---Michael Hagerty