Dr. Gunther von Hagens, who invented the process for plastination back in the 1970s, told "20/20" -- through tears -- that some of the bodies he acquired in China a few years ago may have been those of executed prisoners, bodies he said he cremated and never put on public display.

"There is now no way for me any more to work with specimens from China so I had to distance myself from that," he said.
(ABC News)