This article is from the Dr. Pepper FAQ, by Christopher Flaherty with numerous contributions by others.
The connection here is a little more tenuous than the one for JFK
above, but here it is:
In 1968, Reverend Dr. Martin Luther King, Jr. was assassinated, and
James Earl Ray was convicted of that crime after pleading guilty to it
in 1969. However, within days of that conviction, Ray insisted that
he was innocent, and kept insisting it right up until his death in