Dr. Pepper–
Correct!
Ben Franklin was on the half-dollar from 1948 thru 1963
In 1964 John F. Kennedy replaced Franklin.
Other circulating coins last had non-presidential men on their obverses as follows:
Nickel – Indian, 1938. Replaced by Jefferson in 1938 (there was an overlap).
blinky–
Your first step – 1C and 1W cross and 1C comes back – leaves three cannibals and two suppers on the original riverbank.