I could've sworn Peter Marshall was in La Cage aux Folles when I saw the show on Broadway, my second Broadway show. I had been on a work trip in Northern New Jersey and took NJ Transit into the city at the end of the day and went straight to TKTS where I asked for a ticket for either A Chorus Line or La Cage, whichever had the better available seat.
However, I couldn't find any evidence that Marshall ever performed in the show on Broadway, although he did tour with it. Finally, I read in his obit that he had spent a year on Broadway in the show.
I didn't see La Cage again until it was at the Kennedy Center (2012), where George Hamilton played the part Marshall had played.