I remember those days. During the 70s, I would go to see Pyramid tape after high school at the Elysee Theater. Clayton was the announcer and never missed a taping till 1978. On two occasions, he had a seizure. The first one, in '78, he collapsed in the balcony falling down the stairs. There was a commotion which Dick Clark heard backstage. He came out and told Bob to stay put. An ambulance was called. After Bob was taken to the hospital, they continued with the tapings. IIRC, Fred Foy was called in to take over the announcing duties. Clayton missed several weeks of tapings.
In '79, as they were about to tape a show, Clayton said he felt faint. An ambulance was called. I think Dick Clark did the intro for a couple of shows. Clayton was absent for several weeks when the news broke that he died. I recall someone brought the entertainment paper Variety to the theater. That's how a few of the regular theater attendees found out about it.