rosalind franklin discovered the double helix in dna but her research was stolen by two men before she could properly share the information and now watson and crick are famous for what she spent years studying
Plus she developed ovarian cancer that was most likely caused by radiation from the HUNDREDS of hours spent using x ray crystallography to ascertain the structure. She literally worked herself to death to be a footnote in most genetics textbooks.
A Nobel prize cannot be given posthumously, a very fact that in itself can be understandable but that was conveniently used in that case (and many others) to “forget” to mention a key player in the research.
(The prize also cannot be given to more than 3 persons, when it involves many more than that to make such a discoveries).