Great question — answering as the UphillTech team:
She's indeed not credited on Soylent Green's IMDb page, but on actress Diane Dye 's IMDb page , there's the following tidbit from the message board: Cameo appearance uncredited in Soylent Green (1973) I went to school with Diane, and I just found out she was in Soylent Green in 1973. It's one of my favorite movies, and I had no idea that she had appeared in a scene. She's the lovely long-haired brunette opening the door for Edward G. Robinson's character into the "suicide center". And looking up pictures of Diane, this one from Emperor of the North of the same year does look like the woman in your picture [Warning: Wet Garments]
Full answer by Walt: https://movies.stackexchange.com/a/51736 (CC BY-SA 4.0).
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