A DNA match shows I'm a 4c1r of Rita Hayworth (Cansino-2), but I don't know if there are any documents to prove this.

Question

Shouldn't the Cansino-2 profile include her famous nickname, "Rita"? Have you ever included her as a featured connection?

Answer 1

You don't give any info on the size of the match, or it's location. Some matches on various chromosome sections can be widely shared, either generally or to families grom the same locality, also as the shared cM figure gets lower the rate of false matches increases, so by the time the shared cM drops to 7, the false matches can be 50-60%.
 And not every relationship that has transmitted DNA is recorded.
 I find the shared match list useful and get suspicious if there are no shared matches.

Comments

Thank you very much! This may be my first treehouse question. The match is 47 cM across 2 segments and also matches my paternal aunt with 41 cM across 2 segments. It's on Ancestry, so there's no location information. The documentation problem goes back to the early 1800s, trying to connect my 3rd great-grandmother to her parents and the sibling who is Rita Hayworth's ancestor. The match and I and the match and my aunt have many shared matches.

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Sounds like a valid match and that you are on the right track, shame the matches are not on MyHeritage, the Chromosome browser is a valuable tool.
 Finding the missing records is always a pain.

Posting about what records you are needing could be helpful, someone else may find something.